---
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: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L'
cwe:
  - CWE-79
vendor: joomla
product: joomla!
affected:
  - 'joomla! >= 1.5.0, < 5.4.8'
  - 'joomla! >= 6.0.0, < 6.1.3'
patched:
  - joomla! 6.1.3
published: '2026-09-29'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T16:41:22.977'
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
epss: 0.00268
epssPercentile: 0.18874
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-30T15:10:16.956004Z'
scores:
  nvd: 6.7
  cna: 7.1
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.

## Affected

- `joomla! >= 1.5.0, < 5.4.8`
- `joomla! >= 6.0.0, < 6.1.3`

## Remediation

Upgrade past the affected range:

- `joomla! 6.1.3`