Vulnerability Description
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 restrictions on email address domains or invitations being required to join, but has disabled the EmailAuthBackend that is used for email/password authentication. A bug in the Zulip server means that it is possible to create an account in such organizations, without having an account with the configured SSO authentication backend. This issue is patched in version 10.2. A workaround includes requiring invitations to join the organization prevents the vulnerability from being accessed.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zulip | Zulip Server | < 10.2 |
Related Weaknesses (CWE)
References
- https://github.com/zulip/zulip/commit/b5ab90aaa4a7efdcbf886cb9e7d55fa5bfca3a28
- https://github.com/zulip/zulip/security/advisories/GHSA-qxfv-j6vg-5rqcThird Party Advisory
FAQ
What is CVE-2025-31478?
CVE-2025-31478 is a vulnerability with a CVSS score of 8.2 (HIGH). 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, mea...
How severe is CVE-2025-31478?
CVE-2025-31478 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-31478?
Check the references section above for vendor advisories and patch information. Affected products include: Zulip Zulip Server.