CVE-2018-20490

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-12-30 · updated 2026-06-17
Weakness: CWE-79

Description

An issue was discovered in GitLab Community and Enterprise Edition 11.2.x through 11.4.x before 11.4.13, 11.5.x before 11.5.6, and 11.6.x before 11.6.1. It allows XSS.

Affected products

GitLab: from 11.2.0 before 11.4.13; from 11.5.0 before 11.5.6; from 11.6.0 before 11.6.1 — fixed in 11.4.13, 11.5.6, 11.6.1

How to fix

Upgrade to a fixed version: GitLab 11.4.13, 11.5.6, 11.6.1. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/2018/12/31/security-release-gitlab-11-dot-6-dot-1-released/
https://gitlab.com/gitlab-org/gitlab-ce/issues/54377
https://about.gitlab.com/2018/12/31/security-release-gitlab-11-dot-6-dot-1-released/
https://gitlab.com/gitlab-org/gitlab-ce/issues/54377

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