CVE WatchJul 24, 2026

CVE-2026-57530

Milkdown before 7.21.3 contains a stored cross-site scripting vulnerability in the @milkdown/preset-commonmark and @milkdown/components pack

CVSS

5.4

Medium

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jul 24, 2026 · Last modified: Jul 24, 2026 · CWE-79

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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CVECVSSEPSSKEVRExploitTitleMod.

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