Medium [CVE-2026-16255] 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
This medium-severity GitLab advisory covers CVE-2026-16255 affecting GitLab.
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Summary
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.
- before 19.3.6
- before 19.4.3
- before 19.5.1
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
- 19.3.6
- 19.4.3
- 19.5.1
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 19.3.6, 19.4.3, 19.5.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
Discussion(0)
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