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CVE-2026-3254

Improper Restriction of Rendered UI Layers or Frames in GitLab

CVSS 3.5 LOWEPSS 0.2%CWE-1021
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Affected products
GitLab · GitLab
public PoCs found — 1
cve_referencehackerone.com/reports/3572752unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References
https://gitlab.com/gitlab-org/gitlab/-/work_items/591587https://hackerone.com/reports/3572752