CVE-2026-57531

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.

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/plugin-emoji
https://www.vulncheck.com/advisories/milkdown-dom-xss-via-innerhtml-assignment

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-2026-57531

Mitre link : CVE-2026-57531

CVE.ORG link : CVE-2026-57531

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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