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CVE-2026-73492— Loofah `allowed_uri?` does not detect `javascript:` URIs split by numeric character references without semicolons

Quick assessment

Affected
flavorjones loofah
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mike Dalessio Loofah是Mike Dalessio个人开发者开源的一款HTML文档处理组件。 Mike Dalessio Loofah 2.25.0版本至2.25.2之前版本存在安全漏洞，该漏洞源于Loofah::HTML5::Scrub.allowed_uri?对URI校验不充分，未能拒绝方案被数字字符引用分割的javascript:或vbscript: URI，可能导致跨站脚本攻击。

CVSS 2.3 · Low EPSS 0.39% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
flavorjones loofah >= 2.25.0, < 2.25.2 affected
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I. Basic Information for CVE-2026-73492

Vulnerability Information
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Vulnerability Title
Loofah `allowed_uri?` does not detect `javascript:` URIs split by numeric character references without semicolons
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Mike Dalessio Loofah 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mike Dalessio Loofah是Mike Dalessio个人开发者开源的一款HTML文档处理组件。 Mike Dalessio Loofah 2.25.0版本至2.25.2之前版本存在安全漏洞，该漏洞源于Loofah::HTML5::Scrub.allowed_uri?对URI校验不充分，未能拒绝方案被数字字符引用分割的javascript:或vbscript: URI，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
flavorjones loofah >= 2.25.0, < 2.25.2 -

II. Public POCs for CVE-2026-73492

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III. Intelligence Information for CVE-2026-73492

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Patches & Fixes for CVE-2026-73492 (2)

Vendor Advisories for CVE-2026-73492 (1)

Vendor Pages for CVE-2026-73492 (1)

Same Patch Batch · flavorjones · 2026-08-12 · 3 CVEs total

CVE-2026-73490 4.7 MEDIUM Loofah: SVG `href` attribute bypasses local-reference restriction
CVE-2026-73491 2.3 LOW Loofah `allowed_uri?` does not detect `javascript:` URIs split by named whitespace charact

IV. Related Vulnerabilities

Same product: loofah
Same vendor: flavorjones
Same weakness: CWE-79

V. Comments for CVE-2026-73492

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