Vulnerability Description
Milkdown before 7.21.3 contains a DOM cross-site scripting vulnerability in the @milkdown/plugin-emoji package that allows unauthenticated attackers to execute arbitrary JavaScript in the host application's origin by causing a victim to paste attacker-controlled content. The parseDOM.getAttrs handler stores raw innerHTML of pasted span elements with data-type="emoji" without sanitization, and the toMarkdown runner subsequently assigns this unsanitized value directly to a live DOM element's innerHTML, bypassing the DOMPurify sanitization used in the toDOM path, causing payload execution on every markdown serialization cycle.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/Milkdown/milkdown/commit/db1ae721854a0ab2f188b83cf86957029666
- https://github.com/Milkdown/milkdown/pull/2410
- https://github.com/Milkdown/milkdown/releases/tag/v7.21.3
- https://www.npmjs.com/package/@milkdown/plugin-emoji
- https://www.vulncheck.com/advisories/milkdown-dom-xss-via-innerhtml-assignment
FAQ
What is CVE-2026-57531?
CVE-2026-57531 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Milkdown before 7.21.3 contains a DOM cross-site scripting vulnerability in the @milkdown/plugin-emoji package that allows unauthenticated attackers to execute arbitrary JavaScript in the host applica...
How severe is CVE-2026-57531?
CVE-2026-57531 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-57531?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.