CVE-2025-12653

EUVD-2025-199760
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
GitLabCNA
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 15%
Affected Products (NVD)
VendorProductVersion
gitlabgitlab
18.3.0 ≤
𝑥
< 18.4.5
gitlabgitlab
18.3.0 ≤
𝑥
< 18.4.5
gitlabgitlab
18.5.0 ≤
𝑥
< 18.5.3
gitlabgitlab
18.5.0 ≤
𝑥
< 18.5.3
gitlabgitlab
18.6.0
gitlabgitlab
18.6.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
gitlab
sid
17.6.5-19
fixed
Common Weakness Enumeration
References
https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/579372
https://hackerone.com/reports/3370245