---
id: CVE-2026-92231
title: >-
  Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5
  entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - The checkAttribute
  method normalized an attribute value before testing it against the
  "javascript:"…
summary: >-
  Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5
  entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - The checkAttribute
  method normalized an attribute value before testing it against the
  "javascript:"…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:P'
cwe:
  - CWE-79
vendor: Joomla! Project
product: Joomla! CMS
affected:
  - joomla_cms 1.5.0-5.4.8
  - joomla_cms 6.0.0-6.1.3
  - joomla_framework_filter_package 1.0.0-3.0.6
  - joomla_framework_filter_package 4.0.0-4.1.0
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T17:17:14.930'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92231'
references:
  - url: >-
      https://developer.joomla.org/security-centre/1095-20260915-core-xss-filter-bypass-in-inputfilter-via-html5-entity-decode-mismatch.html
    label: security@joomla.org
  - url: 'https://www.joomla.org/'
    label: security@joomla.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-29T17:41:02.212Z'
---

## Overview

Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5 entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - The checkAttribute method normalized an attribute value before testing it against the "javascript:" scheme regex, however without decoding HTML5 entities beforehand, causing an XSS vector.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.