Authorization Bypass Through User-Controlled Key in GitLab
CVE-2026-6552

8.7HIGH

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
11 June 2026

What is CVE-2026-6552?

GitLab has remediated an issue in GitLab EE affecting all versions from 15.5 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user with group Owner role to take over another group member's GitLab account due to improper authorization in the Group SAML identity management functionality.

Affected Version(s)

GitLab 15.5 < 18.10.8

GitLab 18.11 < 18.11.5

GitLab 19.0 < 19.0.2

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/597295
https://hackerone.com/reports/3655189
technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/06/10/patch-releas...

CVSS V3.1

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [cyberjoker](https://hackerone.com/cyberjoker) for reporting this vulnerability through our HackerOne bug bounty program
.