CVE-2023-5356 Incorrect Authorization in GitLab

What is CVE-2023-5356?

CVE-2023-5356 is a high-severity missing authorization vulnerability in Gitlab Gitlab, published on 12 Jan 2024. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

Incorrect authorization checks in GitLab CE/EE from all versions starting from 8.13 before 16.5.6, all versions starting from 16.6 before 16.6.4, all versions starting from 16.7 before 16.7.2, allows a user to abuse slack/mattermost integrations to execute slash commands as another user.

Weakness: CWE-863

Which versions are affected by CVE-2023-5356?

1 open source package ship an affected version, including gitlab. It affects 1 product.

Products include Gitlab Gitlab.

How do I fix CVE-2023-5356?

Upgrade gitlab to a fixed version for your release line: 16.5.6, 16.6.4 or 16.7.2.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2023-5356 being exploited?

There is no known exploitation of CVE-2023-5356 in the wild and no public exploit code.

Other vulnerabilities in Gitlab Gitlab

• CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound Exploited Critical 10.0
• CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal Exploited Critical 10.0
• CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control Exploited Critical 10.0
• CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution Exploited Critical 10.0
• CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Exploited Medium 6.8

All Gitlab Gitlab vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-gitlab-2023-5356, GHSA-x7v8-7cpc-hv73, UBUNTU-CVE-2023-5356.