CVE-2026-3254
Improper Restriction of Rendered UI Layers or Frames in GitLab
Vexday Risk Score
28Low
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 3.5EPSS 0.2%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
22 Apr 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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 · GitLabpublic 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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