BIT-gitlab-2026-3254

vendorUSosv

Improper Restriction of Rendered UI Layers or Frames in GitLab

view advisory published 2026-04-24Licence: per source

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-3254US	—	0.15% (4th)	—	2026-04-22
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 unaut…

references

External citations — patches, advisories, analysis.

https://gitlab.com/gitlab-org/gitlab/-/work_items/591587WEB
https://hackerone.com/reports/3572752WEB
https://nvd.nist.gov/vuln/detail/CVE-2026-3254WEB

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