CVE-2026-57530
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.
How to fix
- Milkdown milkdown7.21.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Milkdown milkdown | v < 7.21.3 | 7.21.3 |
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Attack Surface Management
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