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Joomla! Improper Input Handling in Filter Framework Leading to Cross-Site Scripting Vulnerability

Vulnerability

A cross-site scripting (XSS) vulnerability has been identified in the Joomla! CMS within the input filter framework. This issue arises from inadequate content filtering in the checkAttribute method, which could be exploited to inject malicious scripts. The vulnerability affects Joomla! CMS versions 3.0.0 through 3.10.20-elts, 4.0.0 through 4.4.13, and 5.0.0 through 5.3.3.

Impact

Exploitation of this vulnerability allows for cross-site scripting, where an attacker can inject malicious scripts that are executed in the context of the user's browser.

Remediation

Users are advised to upgrade to Joomla! CMS version 4.4.14 or 5.3.4.

Added: Sep 30, 2025, 4:24 PM
Updated: Sep 30, 2025, 5:18 PM

Vulnerability Rating

Custom Algorithm
spread
7.6
impact
1.7
exploitability
4.7
remediation
7.7
relevance
0.6
threat
0.0
urgency
2.9
incentive
1.7

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.