Improper Authentication in Zulip Server - CVE-2025-31478
Published: April 17, 2025
Vulnerability identifier: #VU107580
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-31478
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to authentication backend configuration bypass. A remote attacker can create an account without having an account with the configured SSO authentication backend.
Affected software
Zulip Server
How to mitigate CVE-2025-31478
Install updates from vendor's website.
Zulip Server - update to 10.2