UpHeron
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Servers and applications

CVE-2026-2973

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.7 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to execute arbitrary JavaScript in a user's browser due to improper sanitization of entity-encoded content in Mermaid diagrams.

Severity
Medium 5.4
Published
25 Mar 2026
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
18.8.7, 18.9.3
Sources
NVD

Affected software

SoftwareAffected versions
GitLabServers and applications · cpe:a:gitlab:gitlab
  • From 17.7.0 before 18.8.7
  • From 18.9.0 before 18.9.3
  • Version 18.10.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-2973
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-2973