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Servers and applications

CVE-2026-16255

Incorrect Authorization in GitLab

Severity
High 7.1
Published
21 Oct 2026
Last changed
30 Oct 2026
Added to UpHeron
23 Oct 2026
Fixed in
19.3.6, 19.4.3, 19.5.1
Sources
NVD, CVE Program

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…

Affected software

SoftwareAffected versions
GitLabServers and applications · cpe:a:gitlab:gitlab
  • From 12.0.0 before 19.3.6
  • From 19.4.0 before 19.4.3
  • Version 19.5.0
  • From 19.5 before 19.5.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-16255
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-16255