flavorjones Loofah up to 2.25.1 HTML5 Scrub Scrub.allowed_uri HTML injection

Summaryinfo

A vulnerability classified as problematic was found in flavorjones Loofah up to 2.25.1. This affects the function Loofah::HTML5::Scrub.allowed_uri of the component HTML5 Scrub. The manipulation results in HTML injection. This vulnerability was named CVE-2026-73492. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in flavorjones Loofah up to 2.25.1. Affected is the function Loofah::HTML5::Scrub.allowed_uri of the component HTML5 Scrub. The manipulation with an unknown input leads to a html injection vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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 &#58, &#9, &#10, or &#13. 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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-73492 since 08/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 2.25.2 eliminates this vulnerability.

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Productinfo

Vendor

• flavorjones

Name

• Loofah

Version

• 2.25.0
• 2.25.1

Website

• Product: https://github.com/flavorjones/loofah/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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