We released Zulip Server 12.4 today! This release fixes six security issues,
removes trust in the certificate authority affected by the eMudhra CA key
compromise, and fixes a few bugs.
We have requested CVE IDs for these issues, but they have not been assigned yet.
Each is referenced by its GitHub security …
We released Zulip Server 12.3 today! This is a security release, fixing a
critical security issue (GHSA-42mq-rxcr-wj72) and three other security issues,
as well as several bugs.
We have requested CVE IDs for these issues, but they have not yet been assigned.
Each issue is instead referenced below by …
We released Zulip Server 12.2 today! This release fixes five security issues and
a couple of bugs.
We have requested CVE IDs for these issues, but they have not yet been assigned.
Each issue is instead referenced below by its GitHub security advisory.
Upgrading
We recommend that all installations upgrade …
We released Zulip Server 12.1 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 12.0.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been upgraded with the
…
We’re excited to announce the release of Zulip Server 12.0, containing hundreds
of new features and bug fixes: end-to-end encryption for mobile push
notifications, a major upgrade for Docker, configurable image previews, and much
more! Almost 5,500 new commits have been merged across the project since …
We released Zulip Server 11.6 today! This release fixes two security issues
(CVE-2026-26058 and CVE-2026-25742), and several bugs.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been upgraded …
We released Zulip Server 11.5 today! This release makes several improvements to
the installation experience for the Docker image, as well as fixing a security
issue (CVE-2026-24050), and several bugs.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
…
We released Zulip Server 11.4 today! This is a bug fix release, containing one
bugfix to Zulip Server 11.3.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been upgraded with the
improvements …
We released Zulip Server 11.3 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 11.2.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been upgraded with the
…
We released Zulip Server 11.2 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 11.1.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been upgraded with the
…
We released Zulip Server 11.1 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 11.0.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been upgraded with the
…
We’re excited to announce the release of Zulip Server 11.0, containing hundreds
of new features and bug fixes: message reminders, support for channels without
topics, channel folders, and so much more! Over 3,300 new commits have been
merged across the project since the 10.0 release in March.
Zulip
…
We released Zulip Server 10.4 today! This is a security release, fixing an
important security issue (CVE-2025-52559), as well as several bugs.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. Zulip Cloud has already been …
We released Zulip Server 10.3 today! This is a security release, fixing a
security issue (CVE-2025-47930), as well as several bugs, most importantly an
issue with LDAP synchronization of user roles.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
…
We released Zulip Server 10.2 today! This is a security release, fixing a
critical security issue (CVE-2025-31478), as well as several bugs, most
importantly a collection of issues that prevented servers using some
S3-compatible block storage services from successfully uploading files on Zulip
Server …
We released Zulip Server 10.1 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 10.0.
All three security issues are low severity for installations where all Zulip
organizations have the same set of trusted administrators.
Upgrading
We …
We’re excited to announce the release of Zulip Server 10.0, containing hundreds
of new features and bug fixes!
Zulip
is an open-source team chat application designed for seamless remote and hybrid
work. With conversations
organized by topic, Zulip is
ideal for both live and asynchronous
communication. …
We released Zulip Server 9.4 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 9.3.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation.
Commercial support …
We released Zulip Server 9.3 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 9.2.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation.
Commercial support for server upgrades is available …
We released Zulip Server 9.2 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 9.1.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation.
Commercial support for server upgrades is available …
We released Zulip Server 9.1 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 9.0.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation.
Commercial support for server upgrades is available …
We released Zulip Server 8.5 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 8.4.
We expect this to be the final Zulip 8.x release, since Zulip 9.0 was
released last week.
Upgrading
This release is recommended for all Zulip installations that are not yet ready
to …
We’re excited to announce the release of Zulip Server 9.0, containing hundreds
of new features and bug fixes!
Zulip
is an open-source team chat application designed for seamless remote and hybrid
work. With conversations
organized by topic, Zulip is
ideal for both live and asynchronous
communication. …
We released Zulip Server 8.4 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 8.3.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
…
We released Zulip Server 8.3 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 8.2.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We released Zulip Server 8.2 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 8.1.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
…
We released Zulip Server 8.1 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 8.0.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We’re excited to announce the release of Zulip Server 8.0, containing hundreds
of new features and bug fixes!
Zulip
is an open-source team chat application designed to help people collaborate to
solve any challenge. With conversations
organized by topic, Zulip is
ideal for both live and asynchronous
…
We released Zulip Server 7.5 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 7.4.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We released Zulip Server 7.4 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 7.3.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We released Zulip Server 7.3 today! This is a security release, containing
important security fixes and cherry-picked changes since Zulip Server 7.2.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We released Zulip Server 7.2 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 7.1.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
…
We released Zulip Server 7.1 today! This is a bug fix release, containing
cherry-picked changes since Zulip Server 7.0.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
…
We’re excited to announce the release of Zulip Server 7.0, containing hundreds
of new features and bug fixes!
Zulip is an open-source team chat application designed to
help people collaborate to solve any challenge. With conversations
organized by topic, Zulip is
ideal for both live and asynchronous
…
We released Zulip Server 6.2 today! This is a security release, containing two
security fixes and several cherry-picked changes since Zulip Server 6.1.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We released Zulip Server 6.1 today! This is a bugfix release, containing
cherry-picked changes since Zulip Server 6.0.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
…
We’re excited to announce the release of Zulip Server 6.0, containing hundreds
of new features and bug fixes!
Zulip is an open-source team chat application designed to
help people collaborate to solve any challenge. With conversations
organized by topic, Zulip is ideal
for both live and asynchronous …
We released Zulip Server 5.7 today! This is a security release, containing a
security fix and several cherry-picked changes since Zulip Server 5.6.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort …
We released Zulip Server 5.6 today! This is a security release, containing an
important security fix and several cherry-picked changes since Zulip Server 5.5.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need …
We released Zulip Server 5.5 today! This is a security release, containing an
important security fix and several cherry-picked changes since Zulip Server 5.4.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need …
We released Zulip Server 5.4 today! This is a security release, containing a
security fix and several cherry-picked changes since Zulip Server 5.3.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort …
We released Zulip Server 5.3 today! This is a security release, containing a
minor security fix and several cherry-picked changes since Zulip Server 5.2.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, …
We released Zulip Server 5.2 today! This is a bugfix release, containing
cherry-picked changes since Zulip Server 5.1.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
…
We released Zulip Server 5.1 today! This is a bugfix release, containing a few
cherry-picked changes since Zulip Server 5.0, primarily to address upgrading
bugs.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you …
We’re excited to announce the release of Zulip Server 5.0, containing hundreds
of new features and bug fixes!
Zulip is an open-source team collaboration tool with
unique topic-based threading that is ideal for
both live and asynchronous conversations. Fortune 500 companies, leading
open-source projects, …
We released Zulip Server 4.11 today! This is a security release, containing a
minor security fix.
Upgrading
We recommend that all installations upgrade to this new release. See the
upgrade instructions
in the Zulip documentation. If you need help, best-effort support is available
on chat.zulip.org.
…
We released Zulip Server 4.10 today! This is a security release, containing
important security fixes, as well as important cherry-picked bug fixes, since
Zulip Server 4.9.
Upgrading
We strongly recommend that all installations upgrade to this new release. See
the
upgrade instructions
in the Zulip documentation. …
We released Zulip Server 4.9 today! This is a security release, containing
critical security fixes, as well as important cherry-picked bug fixes, since
Zulip Server 4.8.
Upgrading
We strongly recommend that all installations upgrade to this new release. See
the
upgrade instructions
in the Zulip documentation. …
We released Zulip Server 4.8 today! This is a security release, containing
important security fixes, as well as important cherry-picked bug fixes, since
Zulip Server 4.7.
Deprecating support for Ubuntu 18.04 Bionic
With this release, we are deprecating support for Ubuntu 18.04 Bionic.
Specifically, …
We released Zulip Server 4.7 today! This is a security release, containing minor
security fixes since Zulip Server 4.6.
What’s new
This release fixes CVE-2021-41115, which prevents organization administrators
from affecting the server with a regular expression denial-of-service attack
through linkifier …
We released Zulip Server 4.6 today! This is a bug fix release, containing a few
dozen cherry-picked changes since Zulip Server 4.5.
What’s new
This release fixes the following issues:
Documented official support for Debian 11 Bullseye, now that it is officially
released by Debian upstream.
Fixed installation …
We released Zulip Server 4.4 today! This is a security release, containing
important security fixes, as well as important cherry-picked bug fixes, since
Zulip Server 4.3.
What’s new
This release fixes the following issues:
Added a tool to fix potential database corruption caused by host OS upgrades;
…
We released Zulip Server 4.3 today! This is a bug fix release, containing a few
cherry-picked changes since Zulip Server 4.2.
What’s new
This release fixes the following issues:
Fixed exception when upgrading older servers that had disabled the Jitsi
integration by setting JITSI_SERVER_URL to None.
…
We’re excited to announce the release of Zulip Server 4.0, containing hundreds
of new features and bug fixes! Zulip is an open-source
team collaboration tool with unique
topic-based threading that combines the best of
email and chat to make remote work productive and delightful. Fortune 500
companies, …
Zulip Server 3.4 was released today! This is a security release, containing
important security updates for the 3.x series of Zulip Server.
This will likely be the last release in the 3.x stable release series, as we are
getting close to publishing the first release candidate for Zulip 4.0.
What’s new
…
We released Zulip Server 3.3 today! This is a bug fix release, containing a few
cherry-picked changes since Zulip Server 3.2.
What’s new
This releases fixes multiple important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Guest users
should not be allowed to post to …
We released Zulip Server 3.2 today! This is a bug fix release, containing a few
cherry-picked changes since Zulip Server 3.1.
What’s new
This releases fixes multiple important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Switched from libmemcached to python-binary-memcached, …
Today we released Zulip Desktop 5.4.3, fixing a security issue:
CVE-2020-24582: Zulip Desktop failed to escape various strings interpolated
into the user interface HTML. This could result in code execution when
connecting to a maliciously altered Zulip server.
The Zulip security team discovered this …
We released Zulip Server 3.1 today. This is a bug fix release, containing a few
dozen cherry-picked changes since Zulip Server 3.0.
What’s new
This releases fixes multiple important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Removed unused short_name field from …
We’re excited to announce the release of Zulip Server 3.0, containing hundreds
of new features and bug fixes to help distributed and remote teams stay
productive and focused.
Zulip is the open-source threaded team chat app, used by
thousands of teams globally. Zulip’s unique
topic-based threading experience …
We released Zulip Server 2.1.7 today. This is a security release, containing a
couple cherry-picked changes since Zulip Server 2.1.6.
What’s new
This releases fixes multiple important bugs in previous versions of Zulip. It
contains fixes for the following issues:
CVE-2020-15070: Fix privilege escalation …
We released Zulip Server 2.1.5 today. This is a security release, containing a
dozen cherry-picked changes since Zulip Server 2.1.4.
What’s new
This releases fixes several important bugs in previous versions of Zulip. It
contains fixes for the following issues:
CVE-2020-12759: Fix reflected XSS vulnerability …
Today we released Zulip Desktop 5.2.0, fixing a critical security issue:
CVE-2020-12637: Zulip Desktop 0.5.10 introduced a certificate validation
handler to support the undocumented ignoreCerts option available by manually
editing the configuration file. However, the handler inadvertently disabled
…
We released Zulip Server 2.1.4 today. This is a bug fix release, containing
several cherry-picked changes since Zulip 2.1.3.
What’s new
This releases fixes a few important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Fixed a regression in 2.1.3 that impacted creating …
We released Zulip Server 2.1.3 today. This is a security release, containing a
few dozen cherry-picked changes since Zulip 2.1.2.
What’s new
This releases fixes several important bugs in previous versions of Zulip. It
contains fixes for the following issues:
CVE-2020-9444: Reverse tabnabbing vulnerability …
Today we released Zulip Desktop 5.0.0, fixing multiple critical security issues
as well as several other important issues:
CVE-2020-10856: Remote code execution due to missing context isolation.
CVE-2020-10857: Remote code execution due to unsafe use of shell.openExternal
and shell.openItem.
Downloaded …
Today we released Zulip Desktop 4.0.3, fixing a critical security issue:
CVE-2020-9443: Web security was disabled in the Electron webview.
This is a critical security issue because Zulip’s security model for uploaded
files relies on the browser (in this case Electron) enforcing the web security
model. …
We released Zulip Server 2.1.2 today. This is a security release, containing a
few dozen cherry-picked changes since Zulip 2.1.1.
What’s new
This releases fixes several important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Corrected fix for CVE-2019-19775 (the original …
We released Zulip Server 2.1.1 today. This is a bug fix release, containing
several cherry-picked changes since Zulip 2.1.1.
What’s new
This releases fixes a few important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Fixed upgrading to 2.1.x with the LDAP integration …
We’re excited to announce the release of Zulip Server 2.1, containing hundreds
of new features and bug fixes.
Zulip is the world’s most productive team chat
software, used by thousands of teams as an alternative to Slack, HipChat,
Mattermost and IRC. Zulip’s unique
topic-based threading combines the …
We released Zulip Server 2.0.8 today. This is a security release, containing a
handful of cherry-picked changes since Zulip 2.0.7.
What’s new
This release fixes a security bug in Zulip 1.9.0 and greater:
CVE-2019-19775: Close open redirect in thumbnail view.
Upgrading
All installations should upgrade …
We released Zulip Server 2.0.7 today. This is a security release, containing a
handful of cherry-picked changes since Zulip 2.0.6.
What’s new
This release fixes an important security bug in previous versions of Zulip.
Quoting from
the commit
fixing it:
CVE-2019-18933: Fix insecure account creation via …
We released Zulip Server 2.0.6 today. This is a bug fix release, containing
several cherry-picked changes since Zulip 2.0.5.
What’s new
This releases fixes a few important bugs in previous versions of Zulip. It
contains fixes for the following issues:
Updated signing keys for the PGroonga repository …
We released Zulip Server 2.0.5 today. This is a security release, containing a
handful of cherry-picked changes since Zulip 2.0.4.
What’s new
This releases fixes a few important bugs in previous versions of Zulip. It
contains fixes for the following security issues:
CVE-2019-16215: Fix DoS vulnerability …
We released Zulip Server 2.0.4 today. This is a bug fix release, containing a
dozen cherry-picked changes since Zulip 2.0.3.
What’s new
This releases fixes a few important bugs in Zulip 2.0.3. It contains the
following changes:
Fixed several configuration-dependent bugs that caused restore-backup to
…
We released Zulip Server 2.0.3 today. This is a bug fix release, containing a
few dozen cherry-picked changes since Zulip 2.0.2.
What’s new
This releases fixes a few important bugs in Zulip 2.0.2. It contains the
following changes:
Added documentation for
upgrading the underlying OS version.
Made uwsgi …
We released Zulip Server 2.0.2 today. This is a bug fix release, containing a
dozen cherry-picked changes since Zulip 2.0.1.
What’s new
This releases fixes a few important bugs in Zulip 2.0.1. It contains the
following changes:
Fixed a regression in the puppet configuration for S3 upload backend that …
We released Zulip Server 2.0.1 today. This is a bug fix release, containing a
dozen cherry-picked changes since Zulip 2.0.0.
What’s new
This releases fixes a few important bugs in Zulip 2.0.0. It contains the
following changes:
Fixed handling of uploaded file routing on Ubuntu Trusty.
Fixed buggy behavior …
We’re excited to announce the release of Zulip Server 2.0, containing hundreds
of new features and bug fixes.
Zulip is the world’s most productive team chat
software, used by thousands of teams as an alternative to Slack, HipChat,
Mattermost and IRC. Zulip’s unique
topic-based threading combines the …
We released Zulip Server 1.9.2 today. This is a bug fix release, containing a
few dozen cherry-picked changes since 1.9.1.
What’s new
This release is primarily to migrate Zulip off the deprecated Google+ API, which
Google plans to remove entirely on March 9. It also contains a few bug fixes for
the …
We released Zulip Server 1.9.1 today. This is a bug fix release, containing a
few dozen cherry-picked changes since 1.9.0.
What’s new
This release is primarily to improve the experience for users installing a new
Zulip server: new installer options, better error messages, etc.
This release contains …
We’re excited to announce the release of Zulip Server 1.9, containing hundreds
of new features and bug fixes. Especially relevant for users migrating from the
recently discontinued HipChat
is our new HipChat data import
tool.
Zulip is the world’s most productive team chat
software, an alternative to …
Today we’re releasing Zulip Server 1.8.1. This is a bug fix release, containing
a few dozen cherry-picked changes since 1.8.0.
What’s new
The highlights of this release are primarily for folks installing a new Zulip
server: a tool for automatically registering for push notifications, and a bunch
of …
We’re excited to announce the release of Zulip Server 1.8, containing hundreds
of new features and bug fixes.
Zulip is the world’s most productive team chat software,
an alternative to Slack, HipChat, and IRC. Zulip combines the immediacy of chat
with the asynchronous efficiency of email-style threading, …
Today we’re releasing Zulip Server 1.7.2. This is a security release, containing
just a handful of cherry-picked changes since 1.7.1.
What’s new
This release fixes several security issues:
CVE-2018-9986: Fix XSS issues with frontend markdown processor.
CVE-2018-9987: Fix XSS issue with muting notifications.
…
Today we’re releasing Zulip Server 1.7.1. This is a security release, containing
just a handful of cherry-picked changes since 1.7.0.
To readers in the US: happy Thanksgiving! We generally avoid making a security
release just before a major holiday, but we’ve made an exception in this case
because the …
We’re excited to announce the release of Zulip Server 1.7, containing hundreds
of new features and bug fixes.
Zulip is the world’s most productive team chat software,
an alternative to Slack, HipChat, and IRC. Zulip combines the immediacy of chat
with the asynchronous efficiency of email, and is 100% …
We’re excited to announce the release of Zulip Server 1.6.0, containing hundreds
of new features and bug fixes.
Zulip is the world’s most productive group chat software.
Zulip combines the immediacy of chat with the asynchronous efficiency of email,
and is 100% free and open source software.
This is …
Mateusz Mandera
Tim Abbott
Alex Vandiver
Greg Price
Matt Keller
Anders Kaseorg