What’s Vulnerable › Vulnerabilities

CVE-2026-15387: Acceptance of Extraneous Untrusted Data With Trusted Data in GitLab

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-08-31
• Weakness: CWE-349

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 19.1 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have influenced the execution environment of Pipeline Execution Policy enforcement jobs, due to improper handling of job dependencies.

Affected products

• GitLab: from 19.1.0 before 19.1.7; from 19.2.0 before 19.2.5; 19.3.0 — fixed in 19.1.7, 19.2.5

How to fix

Upgrade to a fixed version: GitLab 19.1.7, 19.2.5. Check the vendor advisory for mitigations.

References

• https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/
• https://gitlab.com/gitlab-org/gitlab/-/work_items/605632
• https://hackerone.com/reports/3754358

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