Cross-Site Scripting (XSS) vulnerability through unescaped HTML attribute values

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0024, the 14th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 6 Nov 2025. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-52c5-vh7f-26fx
• OSV: GHSA-52c5-vh7f-26fx
• github.com/etaminstudio/prosemirror_to_html/security/advisories/GHSA-52c5-vh7f-26fx
• nvd.nist.gov/vuln/detail/CVE-2025-64501
• github.com/etaminstudio/prosemirror_to_html/commit/4d59f94f550bcabeec30d298791bbdd883298ad8
• github.com/etaminstudio/prosemirror_to_html
• github.com/etaminstudio/prosemirror_to_html/blob/ea8beb32f6c37f29f042ba4155ccf18504da716e/lib/prosemirror_to_html.rb#L249
• github.com/rubysec/ruby-advisory-db/blob/master/gems/prosemirror_to_html/CVE-2025-64501.yml
• github.com/rubysec/ruby-advisory-db/blob/master/gems/prosemirror_to_html/GHSA-vfpf-xmwh-8m65.yml

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.