CVE-2026-57530

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.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/Milkdown/milkdown/commit/db1ae721854a0ab2f188b83cf8695702966640f1
https://github.com/Milkdown/milkdown/pull/2410
https://github.com/Milkdown/milkdown/releases/tag/v7.21.3
https://www.npmjs.com/package/@milkdown/components
https://www.npmjs.com/package/@milkdown/preset-commonmark
https://www.vulncheck.com/advisories/milkdown-stored-xss-via-javascript-url-in-link-href

Configurations

No configuration.

History

24 Jul 2026, 20:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-24 20:18

Updated : 2026-07-27 20:37

NVD link : CVE-2026-57530

Mitre link : CVE-2026-57530

CVE.ORG link : CVE-2026-57530

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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