CVE-2026-3254 (GCVE-0-2026-3254)
Vulnerability from cvelistv5
Published
2026-04-22 16:29
Modified
2026-04-22 17:39
Severity ?
3.5 (Low) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-1021 - Improper Restriction of Rendered UI Layers or Frames
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.
References
Impacted products
Vendor Product Version
GitLab GitLab Version: 18.11   ≤
    cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
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                "id": "CVE-2026-3254",
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      "credits": [
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          "value": "Thanks [joaxcar](https://hackerone.com/joaxcar) for reporting this vulnerability through our HackerOne bug bounty program"
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          "lang": "en",
          "value": "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\u0027s browser due to improper input validation in the Mermaid sandbox."
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      "metrics": [
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