UpHeron
All vulnerabilities

Servers and applications

CVE-2026-84739

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.

Severity
High 8.7
Published
29 Sept 2026
Last changed
5 Oct 2026
Added to UpHeron
21 Oct 2026
Fixed in
19.2.7, 19.3.3
Sources
NVD

Affected software

SoftwareAffected versions
GitLabServers and applications · cpe:a:gitlab:gitlab
  • From 13.11.0 before 19.2.7
  • From 19.3.0 before 19.3.3
  • Version 19.4.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-84739
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-84739