Auth bypass in Zulip
CVE-2025-31478
Zulip is an open-source team collaboration tool. Zulip supports a configuration where account creation is limited solely by being able to authenticate with a single-sign on authentication backend, meaning the organization places no restric…
Vulnerability class: Broken Authentication
EPSS: 0.005 (66.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Zulip — versions < 10.2
Weakness classification (CWE)
References
- https://github.com/zulip/zulip/security/advisories/GHSA-qxfv-j6vg-5rqc (x_refsource_CONFIRM)
- https://github.com/zulip/zulip/commit/b5ab90aaa4a7efdcbf886cb9e7d55fa5bfca3a28 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-31478?
- CVE-2025-31478 is a high-severity vulnerability in Zulip, classified under Improper Authentication. CVSS score: 8.2/10. Published 2025-04-16.
- How severe is CVE-2025-31478?
- High severity. CVSS v3 base score is 8.2 out of 10.