CVE-2026-84739
GitLab: cross-site scripting
- Risk score
- 60/100
- CVSS
- 8.7 v3.1
- Exploit chance (30 days)
- 0.5%
- Published
- 29 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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…
- Affected
- GitLab before 19.2.7, 19.3, 19.3.3, 19.4, 19.4.1
- Fix
- Upgrade GitLab to 19.2.7, 19.3, 19.3.3, 19.4 or 19.4.1 (whichever matches your release line), or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.7 high
References
Original 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.
Last activity 29 Sep 2026. Patch Forecast updates every hour.