What’s Vulnerable › Vulnerabilities

CVE-2022-24751: Race condition in Zulip

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-16 · updated 2026-06-17
• Weakness: CWE-362

Description

Zulip is an open source group chat application. Starting with version 4.0 and prior to version 4.11, Zulip is vulnerable to a race condition during account deactivation, where a simultaneous access by the user being deactivated may, in rare cases, allow continued access by the deactivated user. A patch is available in version 4.11 on the 4.x branch and version 5.0-rc1 on the 5.x branch. Upgrading to a fixed version will, as a side effect, deactivate any cached sessions that may have been leaked through this bug. There are currently no known workarounds.

Affected products

• zulip: from 4.0 before 4.11 — fixed in 4.11

How to fix

Upgrade to a fixed version: zulip 4.11. Check the vendor advisory for mitigations.

References

• https://github.com/zulip/zulip/commit/62ba8e455d8f460001d9fb486a6dabfd1ed67717
• https://github.com/zulip/zulip/commit/e6eace307ef435eec3395c99247155efed9219e4
• https://github.com/zulip/zulip/security/advisories/GHSA-6v98-m5x5-phqj
• https://github.com/zulip/zulip/commit/62ba8e455d8f460001d9fb486a6dabfd1ed67717
• https://github.com/zulip/zulip/commit/e6eace307ef435eec3395c99247155efed9219e4
• https://github.com/zulip/zulip/security/advisories/GHSA-6v98-m5x5-phqj

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