CVE-2025-6454: Server-Side Request Forgery (SSRF) in GitLab

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-12 · updated 2026-10-19
Weakness: CWE-918

Description

An issue has been discovered in GitLab CE/EE affecting all versions from 16.11 before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2 that could have allowed authenticated users to make unintended internal requests through proxy environments by injecting crafted sequences.

Affected products

GitLab: from 16.11.0 before 18.1.6; from 18.2.0 before 18.2.6; from 18.3.0 before 18.3.2 — fixed in 18.1.6, 18.2.6, 18.3.2

How to fix

Upgrade to a fixed version: GitLab 18.1.6, 18.2.6, 18.3.2. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-2-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/550766
https://hackerone.com/reports/3162711

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