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 allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.

CVSS v3.1

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.29% chance of exploitation in the next 30 days, 21th percentile

Published

2025-11-26

Updated

2025-12-10

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3370245

References

• CVE Record
• NVD entry

Related

• CVE-2025-12630
• CVE-2025-12664
• CVE-2025-12629
• CVE-2025-12669
• CVE-2025-12628
• CVE-2025-12674