CVE-2025-12653
November 26, 2025
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.
Affected Packages
https://gitlab.com/gitlab-org/gitlab.git (SCM_GIT):
Affected version(s) >=v18.5.0-ee <v18.5.3-eeFix Suggestion:
Update to version v18.5.3-eehttps://gitlab.com/gitlab-org/gitlab.git (SCM_GIT):
Affected version(s) >=v18.3.0-ee <v18.4.5-eeFix Suggestion:
Update to version v18.4.5-eehttps://gitlab.com/gitlab-org/gitlab.git (SCM_GIT):
Affected version(s) =v18.6.0-ee <v18.6.1-eeFix Suggestion:
Update to version v18.6.1-eeRelated Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.05
