ZDF
Sign inSign up

Vulnerabilities

Security fix · CVE-2025-31478

Zulip is an open-source team collaboration tool.

Published Apr 16, 2025 · catalog updated Jan 23, 2026 · Zulip is an open-source

Check if you run it

No confirmed exploitation is on record for CVE-2025-31478. EPSS is 0.36%. Act only if a listed version of Zulip is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Zulip is an open-source).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.36%
Remediation
Version ranges on file
Affected products
vendor zulip zulip < 10.2

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor zulip zulip < 10.2< 10.2

How to fix CVE-2025-31478

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-31478. EPSS is 0.36%. Act only if a listed version of Zulip is an open-source is installed.

Which versions are affected?

Compare what you have installed with zulip zulip < 10.2 < 10.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.36%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2025 · EUVD

    Detected

    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

  2. Jan 23, 2026 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-31478

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-31478

    30-day exploitation probability 0.4%

    first.org
  • EUVDVulnerability recordEUVD-2025-11790

    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 invitat

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.