CVE-2026-25742

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//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.

Affected Platforms

Weakness Type

CWE-862

References

• https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236
• https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae
• https://github.com/zulip/zulip/releases/tag/11.6
• https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w
• https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w