CVE-2023-5512: Improper Control of Generation of Code ('Code Injection') in GitLab

Severity: medium (CVSS 5.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-15 · updated 2026-06-17
Weakness: CWE-94

Description

An issue has been discovered in GitLab CE/EE affecting all versions from 16.3 before 16.4.4, all versions starting from 16.5 before 16.5.4, all versions starting from 16.6 before 16.6.2. File integrity may be compromised when specific HTML encoding is used for file names leading for incorrect representation in the UI.

Affected products

GitLab: from 16.3.0 before 16.4.4; from 16.5.0 before 16.5.4; from 16.6.0 before 16.6.2 — fixed in 16.4.4, 16.5.4, 16.6.2

How to fix

Upgrade to a fixed version: GitLab 16.4.4, 16.5.4, 16.6.2. Check the vendor advisory for mitigations.

References

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