CVE-2018-17452

Severity: critical (CVSS 9.8 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: 2023-04-15 · updated 2026-06-17
Weakness: CWE-918

Description

An issue was discovered in GitLab Community and Enterprise Edition before 11.1.7, 11.2.x before 11.2.4, and 11.3.x before 11.3.1. There is Server-Side Request Forgery (SSRF) via a loopback address to the validate_localhost function in url_blocker.rb.

Affected products

GitLab: before 11.1.7; from 11.2.0 before 11.2.4; 11.3.0 — fixed in 11.1.7, 11.2.4

How to fix

Upgrade to a fixed version: GitLab 11.1.7, 11.2.4. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/blog/categories/releases/
https://about.gitlab.com/releases/2018/10/01/security-release-gitlab-11-dot-3-dot-1-released/
https://about.gitlab.com/blog/categories/releases/
https://about.gitlab.com/releases/2018/10/01/security-release-gitlab-11-dot-3-dot-1-released/

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