PT-2026-30211 · Zulip · Zulip

Odgrso · Published 2026-04-03 · Updated 2026-04-03 · CVE-2026-25742

NVD

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-25742

Affected Products

Zulip

References · 5

• 🔥 https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w · Exploit
• https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236 · Patch
• https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-25742 · Security Note
• https://github.com/zulip/zulip/releases/tag/11.6 · Note