What’s Vulnerable › Vulnerabilities

CVE-2026-2104: Authorization Bypass Through User-Controlled Key in GitLab

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-08 · updated 2026-07-25
• Weakness: CWE-639

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to access confidential issues assigned to other users via CSV export due to insufficient authorization checks.

Affected products

• GitLab: from 18.2.0 before 18.8.9; from 18.9.0 before 18.9.5; from 18.10.0 before 18.10.3 — fixed in 18.10.3, 18.8.9, 18.9.5

How to fix

Upgrade to a fixed version: GitLab 18.10.3, 18.8.9, 18.9.5. Check the vendor advisory for mitigations.

References

• https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/
• https://gitlab.com/gitlab-org/gitlab/-/work_items/589021
• https://hackerone.com/reports/3541476

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