Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Joomla! Project | Joomla! CMS | 1.5.0-5.4.8, 6.0.0-6.1.3 | — |
| Joomla! Project | Joomla! Framework Filter package | 1.0.0-3.0.6, 4.0.0-4.1.0 | — |
Advisories 1
- WID-SEC-2026-3636 Joomla: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 29, 2026