Medium severity · published Nov 26, 2025
CVE-2025-12653
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…
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
18.3.0 before 18.4.5; 18.3.0 before 18.4.5; 18.5.0 before 18.5.3; 18.5.0 before 18.5.3; 18.6.0; 18.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12653
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-12653
about.gitlab.com
https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/
Broken Link
https://gitlab.com/gitlab-org/gitlab/-/issues/579372
Permissions Required
https://hackerone.com/reports/3370245
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