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CVE-2025-31478

Zulip Authentication Backend Configuration Bypass

Published: Apr 16, 2025Updated: Jan 23, 2026 Sources: CVE List NVDCWE-287
NVD MITRE
8.2CVSSHIGH
EPSS Score
0.3%
Top 77.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-287

Affected Products

zulip serverzulip
On-premWeb App
Enterprise Software / collaboration-groupware
zulipzulip
On-premWeb App
Enterprise Software / collaboration-groupware
zuliposs-projectEnterprise Softwareaka zulip

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/zulip/zulip/commit/b5ab90aaa4a7efdcbf886cb9e7d55fa5bfca3a28
github.com
https://github.com/zulip/zulip/security/advisories/GHSA-qxfv-j6vg-5rqc
github.com

Timeline

Published
Apr 16, 2025
Last Updated
Jan 23, 2026

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