PT-2026-64409 · Milkdown · Milkdown

Katriel Moses · CVE-2026-57530 · Published 2026-07-24 · Updated 2026-07-24

NVD

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 stored cross-site scripting vulnerability in the @milkdown/preset-commonmark and @milkdown/components packages that allows attackers with document write access to execute arbitrary JavaScript in the browser context of any user who opens the document or clicks a rendered link. The parseMarkdown runner stores raw URL values from the remark AST as href mark attributes without URL scheme validation, and the ineffective DOMPurify.sanitize call in edit-view.ts treats the bare URL string as a text node and returns it unchanged, allowing javascript: payloads to pass through the link-tooltip preview component and read-only mode anchor elements unmodified.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-57530

Affected Products

Milkdown

References · 7

• https://github.com/Milkdown/milkdown/commit/db1ae721854a0ab2f188b83cf8695702966640f1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-57530 · 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/components · Note
• https://vulncheck.com/advisories/milkdown-stored-xss-via-javascript-url-in-link-href · Note
• https://npmjs.com/package/@milkdown/preset-commonmark · Note