What is CVE-2025-64501?

CVE-2025-64501 is a high-severity vulnerability in Etaminstudio Prosemirror To Html, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2025-11-10.

How severe is CVE-2025-64501?

High severity. CVSS v3 base score is 7.6 out of 10.

XSS in Etaminstudio Prosemirror To Html

CVE-2025-64501

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (12.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.

Affected products

Etaminstudio Prosemirror_to_html — versions < 0.2.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-64501?: CVE-2025-64501 is a high-severity vulnerability in Etaminstudio Prosemirror To Html, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2025-11-10.
How severe is CVE-2025-64501?: High severity. CVSS v3 base score is 7.6 out of 10.