CVE-2026-3254

Summary

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.

Affected Software

VendorProductVersion RangeStatus
GitLabGitLab18.11 < 18.11.1affected

Weaknesses

  • CWE-1021: CWE-1021: Improper Restriction of Rendered UI Layers or Frames

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References