CVE-2025-31478
highpriority · track · 0EPSS 0.004 · 30 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (8)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-31478cnnvd
- https://github.com/zulip/zulip/security/advisories/GHSA-qxfv-j6vg-5rqccnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2025-31478cnnvd
- https://zulip.com/apps/Patchcnnvd
- https://github.com/zulip/zulip/commit/b5ab90aaa4a7efdcbf886cb9e7d55fa5bfca3a28enisa_euvd
- https://github.com/zulip/zulip/security/advisories/GHSA-qxfv-j6vg-5rqcenisa_euvd
- https://github.com/zulip/zulip/commit/b5ab90aaa4a7efdcbf886cb9e7d55fa5bfca3a28nvd
- https://github.com/zulip/zulip/security/advisories/GHSA-qxfv-j6vg-5rqcThird Party Advisorynvd
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