CVE-2026-84739
High
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.
SeverityHigh
CVSS8.7
Exploit probability—
Product
Gitlab
PublishedSep 29, 2026
First seenSep 29, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- gitlab gitlab19.2.7, 19.3.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gitlab gitlab | 13.11.0 ≤ v < 19.2.7, 19.3.0 ≤ v < 19.3.3, 19.4.0 | 19.2.7, 19.3.3 |
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