CVE-2026-57531: Milkdown

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Milkdown Milkdown: before 7.21.3 (fixed in 7.21.3)

Published 2026-07-24. Last modified 2026-07-27.