CVE-2018-9243

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-04-05 · updated 2026-06-17
Weakness: CWE-79

Description

GitLab Community and Enterprise Editions version 8.4 up to 10.4 are vulnerable to XSS because a lack of input validation in the merge request component leads to cross site scripting (specifically, filenames in changes tabs of merge requests). This is fixed in 10.6.3, 10.5.7, and 10.4.7.

Affected products

GitLab: from 8.4 before 10.4.7; from 10.5.0 before 10.5.7; from 10.6.0 before 10.6.3 — fixed in 10.4.7, 10.5.7, 10.6.3

How to fix

Upgrade to a fixed version: GitLab 10.4.7, 10.5.7, 10.6.3. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/2018/04/04/security-release-gitlab-10-dot-6-dot-3-released/
https://gitlab.com/gitlab-org/gitlab-ce/issues/42028
https://about.gitlab.com/2018/04/04/security-release-gitlab-10-dot-6-dot-3-released/
https://gitlab.com/gitlab-org/gitlab-ce/issues/42028

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