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CVE-2025-64501

🔴 HIGH

ProsemirrorToHtml is a JSON converter which takes ProseMirror-compatible JSON and outputs HTML. In versions 0.2.0 and below, the `prosemirror_to_html` gem is vulnerable to Cross-Site Scripting (XSS) a...

Published
Nov 10, 2025
Last Modified
Nov 12, 2025
Views
4
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Description

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ProsemirrorToHtml is a JSON converter which takes ProseMirror-compatible JSON and outputs HTML. In versions 0.2.0 and below, the `prosemirror_to_html` gem is vulnerable to Cross-Site Scripting (XSS) attacks through malicious HTML attribute values. While tag content is properly escaped, attribute values are not, allowing attackers to inject arbitrary JavaScript code. Applications that use `prosemirror_to_html` to convert ProseMirror documents to HTML, user-generated ProseMirror content, and end users viewing the rendered HTML output are all at risk of attack. This issue is fixed in version 0.2.1.

CVSS Scores

CVSS 3.1 7.6
7.6
HIGH
CVSS 2.0 7.6

References

github.com github.com

Additional Information

Source
security-advisories@github.com
State
Awaiting analysis

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