{"id":"CVE-2021-43861","aliases":["GHSA-p3rp-vmj9-gv6v"],"url":"https://o3.security/vulnerability/CVE-2021-43861","summary":"Incorrect sanitisation function leads to `XSS` in mermaid","details":"Mermaid is a Javascript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. Prior to version 8.13.8, malicious diagrams can run javascript code at diagram readers' machines. Users should upgrade to version 8.13.8 to receive a patch. There are no known workarounds aside from upgrading.","published":"2021-12-30T14:15:07.547Z","modified":"2026-08-07T19:47:02.757157Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"mermaid","fixedVersion":"8.13.8"}],"fix":{"url":"https://github.com/mermaid-js/mermaid/commit/066b7a0d0bda274d94a2f2d21e4323dab5776d83","label":"mermaid-js/mermaid@066b7a0"},"references":[{"type":"ADVISORY","url":"https://github.com/mermaid-js/mermaid/releases/tag/8.13.8"},{"type":"ADVISORY","url":"https://github.com/mermaid-js/mermaid/security/advisories/GHSA-p3rp-vmj9-gv6v"},{"type":"FIX","url":"https://github.com/mermaid-js/mermaid/commit/066b7a0d0bda274d94a2f2d21e4323dab5776d83"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T19:47:02.757157Z"}}