Milkdown up to 7.21.2 Link-Tooltip Preview edit-view.ts DOMPurify.sanitize cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in Milkdown up to 7.21.2. Impacted is the function DOMPurify.sanitize of the file edit-view.ts of the component Link-Tooltip Preview Component. Executing a manipulation can lead to cross site scripting. The identification of this vulnerability is CVE-2026-57530. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Milkdown up to 7.21.2. This vulnerability affects the function DOMPurify.sanitize of the file edit-view.ts of the component Link-Tooltip Preview Component. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-57530 since 06/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 7.21.3 eliminates this vulnerability.

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Productinfo

Name

• Milkdown

Version

• 7.21.0
• 7.21.1
• 7.21.2

Website

• Product: https://github.com/Milkdown/milkdown/

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