CVE-2025-64501

HIGH

prosemirror_to_html < 0.2.1 - Cross-Site Scripting via HTML Attribute Values

Title source: llm
STIX 2.1

Description

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.

References (2)

Core 2

Scores

CVSS v3 7.6
EPSS 0.0003
EPSS Percentile 7.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
etaminstudio/prosemirror_to_html < 0.2.1
rubygems/prosemirror_to_html 0 - 0.2.1RubyGems
Published Nov 10, 2025
Tracked Since Feb 18, 2026