This vulnerability (CVE-2026-48905) in the Joomla! Framework Filter package is due to improper neutralization of input during web page generation, specifically a lack of input filtering in the HTML filter code. This flaw enables cross-site scripting (CWE-79), which can allow an attacker with high privileges and requiring user interaction to inject malicious scripts. The affected versions include 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. No patch or official remediation level has been published as of the data provided.

Successful exploitation could allow an attacker with high privileges to execute malicious scripts in the context of the affected application, potentially leading to unauthorized actions or data exposure within the scope of the compromised user session. However, exploitation requires user interaction and the attacker must have high privileges, which limits the overall impact. 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. Until an official fix is released, users should exercise caution with input handling in affected versions and consider applying any available workarounds or input sanitization measures. Monitor Joomla! Project advisories for updates.