CVE-2026-73492Public exploitNetwork attack vector

Cross-site scripting via semicolon-less entity bypass

Published Aug 12, 2026 · Updated Aug 12, 2026

Cross-site scripting in Loofah 2.25.0 through 2.25.1 allows remote authenticated users to execute browser script via crafted URIs. The allowed_uri? helper relies on CGI.unescapeHTML, which leaves semicolon-less numeric references encoded, so scheme detection follows the scheme-less path and approves the URI. Exposure requires direct validation of HTML-encoded, user-controlled strings followed by rendering into a browser-interpreted URI attribute; the default sanitize() path is unaffected.

CVSS severity2.3
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Loofah 2.25.0 through 2.25.1 allows remote authenticated users to execute browser script via crafted URIs. The allowed_uri? helper relies on CGI.unescapeHTML, which leaves semicolon-less numeric references encoded, so scheme detection follows the scheme-less path and approves the URI. Exposure requires direct validation of HTML-encoded, user-controlled strings followed by rendering into a browser-interpreted URI attribute; the default sanitize() path is unaffected.

The record

CVE
CVE-2026-73492
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
flavorjones
Product
Loofah
Classifications
CWE-184, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.25.0, < 2.25.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

flavorjones · Loofahversion=>= 2.25.0, < 2.25.2

Published CVSS scores

2.3GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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