AIKIDO-2026-418185
gitlab-ce is vulnerable to Cross-Site Scripting (XSS)
84
High Risk
This Affects:
gitlab-ceTL;DR
identity_mapping? in Gitlab::StringRangeMarker treats a syntax-highlighted line as a one-to-one copy of the raw line whenever the two strings have the same length. An already-safe highlighted line can contain markup of that same length, so a highlight range is written inside a tag and becomes an HTML attribute. A signed-in user can place that markup in a repository and run script in another user's browser when the highlighted file is viewed. The fix treats a line as a one-to-one mapping only when it also contains no markup characters.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and users view syntax-highlighted repository files.
Background info
gitlab-ce is vulnerable to Cross-Site Scripting (XSS) in versions 19.1.0 - 19.2.7, 19.3.0 - 19.3.3 and 19.4.0 - 19.4.1.
How to fix this
Upgrade the gitlab-ce library to the patch version.
Links
docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-2-released/gitlab.com/gitlab-org/gitlab/-/work_items/629523hackerone.com/reports/3936831
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