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CVE-2025-64501— ProsemirrorToHtml: Cross-Site Scripting vulnerability through unescaped HTML attribute values

Quick assessment

Affected
etaminstudio prosemirror_to_html
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ProsemirrorToHtml是Etamin Studio开源的一个HTML代码转换工具。 ProsemirrorToHtml 0.2.0及之前版本存在跨站脚本漏洞，该漏洞源于未正确转义HTML属性值，可能导致跨站脚本攻击。

CVSS 7.6 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-64501

Vulnerability Information
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Vulnerability Title
ProsemirrorToHtml: Cross-Site Scripting vulnerability through unescaped HTML attribute values
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
ProsemirrorToHtml 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ProsemirrorToHtml是Etamin Studio开源的一个HTML代码转换工具。 ProsemirrorToHtml 0.2.0及之前版本存在跨站脚本漏洞，该漏洞源于未正确转义HTML属性值，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
etaminstudio prosemirror_to_html < 0.2.1 -

II. Public POCs for CVE-2025-64501

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6671 chars
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III. Intelligence Information for CVE-2025-64501

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Patches & Fixes for CVE-2025-64501 (1)

Vendor Advisories for CVE-2025-64501 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2025-64501

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