Joomla! CMS vulnerable to XSS via the input filter

MEDIUM 4.8CVE-2025-54476 · GHSA-fm22-g2q9-j3pw · Published 30/09/2025 · updated 17/06/2026

In short

CVE-2025-54476 is a MEDIUM (CVSS 4.8) vulnerability affecting joomla/filter.
Chance of exploitation in the next 30 days (EPSS): 0.31%, higher than 24.4% of all vulnerabilities.
Fix: update to 3.0.5, 4.0.1, 2.0.6 or later.

Package	Affected versions	Patched versions
joomla/filter Packagist	`≥ 3.0.0, < 3.0.5≥ 4.0.0, < 4.0.1< 2.0.6`	`3.0.54.0.12.0.6`

Improper handling of input could lead to a cross-site scripting (XSS) vector in the checkAttribute method of the input filter framework class.

NVD description

Improper handling of input could lead to an XSS vector in the checkAttribute method of the input filter framework class.

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Package

Affected versions

Patched versions

Packagist

≥ 3.0.0, < 3.0.5≥ 4.0.0, < 4.0.1< 2.0.6

3.0.54.0.12.0.6