Vulnerability Description
Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me/<stream_id>/topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zulip | Zulip | >= 1.4.0, < 11.6 |
Related Weaknesses (CWE)
References
- https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236Patch
- https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735baePatch
- https://github.com/zulip/zulip/releases/tag/11.6Release Notes
- https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28wExploitVendor Advisory
- https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28wExploitVendor Advisory
FAQ
What is CVE-2026-25742?
CVE-2026-25742 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_...
How severe is CVE-2026-25742?
CVE-2026-25742 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25742?
Check the references section above for vendor advisories and patch information. Affected products include: Zulip Zulip.