CVE-2026-73492: Flavorjones Loofah
Low severity, CVSS 2.3. EPSS: 0.4% chance of exploitation in the next 30 days.
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed_uri? does not reject javascript: or vbscript: URIs whose scheme is split by semicolon-less numeric character references such as :, 	, 
, or 
. CGI.unescapeHTML leaves these references encoded, so allowed_uri? reports the URL safe even though a browser decodes an encoded colon or strips encoded whitespace and executes the resulting URI scheme. This issue affects only callers that pass HTML-encoded strings directly to allowed_uri?; Loofah's default sanitize() path is not affected. This issue is fixed in version 2.25.2.
Affected products
- Flavorjones Loofah: from 2.25.0, before 2.25.2 (fixed in 2.25.2)
Published 2026-08-12. Last modified 2026-09-09.