This vulnerability (CVE-2026-48905) in the Joomla! Framework Filter package is due to improper neutralization of input during web page generation, classified under CWE-79 (Cross-site Scripting). Specifically, the HTML filter code lacks adequate input filtering, enabling an XSS attack vector. It affects Joomla! Framework Filter package versions 1.0.0 to 3.0.5 and 4.0.0 to 4.0.1. The CVSS 4.0 base score is 6.9, indicating medium severity, with network attack vector, low attack complexity, and requiring high privileges and partial user interaction for exploitation. The vulnerability state is published, but no official remediation level or patch links are available.

Successful exploitation could allow an attacker with high privileges to inject malicious scripts into web pages generated by the Joomla! Framework Filter package, potentially leading to cross-site scripting attacks. This could result in unauthorized actions performed in the context of the affected application. However, the vulnerability requires user interaction and elevated privileges, limiting the ease of exploitation. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level has been provided, users should monitor Joomla! Project advisories for updates. Until a patch is available, consider restricting access to affected versions and applying any recommended configuration changes from the vendor to mitigate exposure.