{"id":"CVE-2021-43861","aliases":["DEBIAN-CVE-2021-43861","EUVD-2022-0654","GHSA-p3rp-vmj9-gv6v","UBUNTU-CVE-2021-43861"],"status":"published","title":"Incorrect sanitisation function leads to `XSS`","description":"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.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00938,"percentile":0.61308,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-79"],"published":"2021-12-30T13:40:11Z","modified":"2026-10-23T18:04:00Z","fixes":[{"ecosystem":"npm","package":"mermaid","fixed_in":["8.13.8"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"node-mermaid","fixed_in":["8.13.8+~cs10.4.16-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"mermaid","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.13.8"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"node-mermaid","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.13.8+~cs10.4.16-1"}]}],"versions":["8.11.0+ds+~cs29.13.22-1","8.13.2+ds+~cs30.13.21-1","8.13.2+ds+~cs30.13.21-1.1","8.13.3+ds+~cs26.13.21-1","8.13.3+ds+~cs26.13.21-2","8.7.0+ds+~cs27.17.17-1","8.7.0+ds+~cs27.17.17-2","8.7.0+ds+~cs27.17.17-2~bpo10+1","8.7.0+ds+~cs27.17.17-3","8.9.1+ds+~cs26.20.25-1","8.9.3+ds+~cs29.13.19-1"]},{"source":"osv","ecosystem":"npm","package":"mermaid","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.13.8"}]}]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"node-mermaid","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.7.0+ds+~cs27.17.17-3","8.13.3+ds+~cs26.13.21-1","8.13.3+ds+~cs26.13.21-2","8.13.8+~cs10.4.16-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"node-mermaid","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.2.2+~2.0.0-1","9.2.2+~2.0.0-2"]}],"products":[{"vendor":"mermaid-js","product":"mermaid"},{"vendor":"mermaid_project","product":"mermaid"}],"references":[{"url":"https://github.com/mermaid-js/mermaid/security/advisories/GHSA-p3rp-vmj9-gv6v","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/mermaid-js/mermaid/commit/066b7a0d0bda274d94a2f2d21e4323dab5776d83","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/mermaid-js/mermaid/releases/tag/8.13.8","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43861","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-p3rp-vmj9-gv6v"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-43861","tags":["advisory"]},{"url":"https://github.com/mermaid-js/mermaid","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2021-43861","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43861","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-43861","title":"Incorrect sanitisation function leads to `XSS`","description":"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.","status":"published","published":"2021-12-30T13:40:11Z","modified":"2024-08-04T04:10:17.137Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-79","CWE-20"],"updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2022-0654","description":"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.","status":"published","published":"2021-12-30T13:40:11Z","modified":"2024-08-04T04:10:17Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T03:24:12.599691Z"}],"ghsa":[{"id":"GHSA-p3rp-vmj9-gv6v","title":"Incorrect sanitisation function leads to `XSS` in mermaid","description":"### Impact\nMalicious diagrams can contain javascript code that can be run at diagram readers machines.\n\n### Patches\nThe users should upgrade to version 8.13.8\n\n### Workarounds\nYou need to upgrade in order to avoid this issue.\n","status":"published","published":"2022-01-06T19:45:59Z","modified":"2023-02-03T05:04:06Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-20","CWE-79"],"updated_at":"2026-11-02T14:36:41.967989Z"}],"nvd":[{"id":"CVE-2021-43861","description":"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.","status":"published","published":"2021-12-30T14:15:07.547Z","modified":"2026-06-17T04:11:35.683Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-20","CWE-79"],"updated_at":"2026-11-02T14:07:02.977492Z"}],"osv":[{"id":"CVE-2021-43861","description":"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.","status":"published","published":"2021-12-30T14:15:07.547Z","modified":"2026-10-20T10:54:12.392897914Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:21.877444Z"},{"id":"DEBIAN-CVE-2021-43861","description":"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.","status":"published","published":"2021-12-30T14:15:07.547Z","modified":"2026-10-23T18:04:00.385141193Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"GHSA-p3rp-vmj9-gv6v","title":"Incorrect sanitisation function leads to `XSS` in mermaid","description":"### Impact\nMalicious diagrams can contain javascript code that can be run at diagram readers machines.\n\n### Patches\nThe users should upgrade to version 8.13.8\n\n### Workarounds\nYou need to upgrade in order to avoid this issue.\n","status":"published","published":"2022-01-06T19:45:59Z","modified":"2026-07-08T06:28:14.087175466Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-20","CWE-79"],"updated_at":"2026-11-02T15:46:52.534897Z"},{"id":"UBUNTU-CVE-2021-43861","description":"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.","status":"published","published":"2021-12-30T14:15:00Z","modified":"2026-10-17T12:56:01.394000847Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:29.220315Z"}]}}