Milkdown up to 7.21.2 plugin-emoji parseDOM.getAttrs cross site scripting

Summaryinfo

A vulnerability has been found in Milkdown up to 7.21.2 and classified as problematic. The affected element is the function parseDOM.getAttrs of the component plugin-emoji. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-57531. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Milkdown up to 7.21.2. This issue affects the function parseDOM.getAttrs of the component plugin-emoji. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-57531 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

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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