PT-2026-64410 · Milkdown · Milkdown

Katriel Moses · CVE-2026-57531 · Published 2026-07-24 · Updated 2026-07-24

Mitre

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-57531

Affected Products

Milkdown

References · 6

• https://github.com/Milkdown/milkdown/commit/db1ae721854a0ab2f188b83cf8695702966640f1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-57531 · Security Note
• https://github.com/Milkdown/milkdown/pull/2410 · Note
• https://github.com/Milkdown/milkdown/releases/tag/v7.21.3 · Note
• https://npmjs.com/package/@milkdown/plugin-emoji · Note
• https://vulncheck.com/advisories/milkdown-dom-xss-via-innerhtml-assignment · Note