Auth bypass in Zulip
CVE-2026-25742
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_E…
Vulnerability class: Broken Access Control
EPSS: 0.001 (18.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Zulip — versions < 11.6
Weakness classification (CWE)
References
- https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w (x_refsource_CONFIRM)
- https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236 (x_refsource_MISC)
- https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae (x_refsource_MISC)
- https://github.com/zulip/zulip/releases/tag/11.6 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-25742?
- CVE-2026-25742 is a medium-severity vulnerability in Zulip, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-04-03.
- How severe is CVE-2026-25742?
- Medium severity. CVSS v3 base score is 5.3 out of 10.