Medium severity5.9NVD Advisory· Published Oct 22, 2026
CVE-2026-16255
CVE-2026-16255
Description
GitLab has remediated an issue in GitLab EE affecting all versions from 12.0 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when the instance-wide SAML or LDAP membership lock was enabled, an authenticated user could have granted or accepted project and group membership outside the identity provider's control, due to incomplete enforcement of the membership lock on requests created before the lock was enabled.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: from 12.0 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1
- Range: from 12.0 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1
Patches
Vulnerability mechanics
References
2News mentions
2- 12-Year-Old GitLab Vulnerability Allows Remote Code Execution on Self-Managed ServerCyber Security News · Oct 22, 2026
- GitLab Critical Patch Release: 19.5.1, 19.4.3, 19.3.6, 19.2.9, 19.1.9, 19.0.10, 18.11.13GitLab Security Releases · Oct 21, 2026