CVE-2026-65946 is a CWE-79 cross-site scripting vulnerability affecting the RO CSVI extension for Joomla. The flaw is due to improper neutralization of input during web page generation in AJAX endpoint handlers, present in versions 1.0.0 up to and including 9.11.0. This allows an attacker to inject malicious scripts that could be executed in the context of a victim's browser. The vulnerability has a CVSS 3.1 base score of 6.1, indicating medium severity, with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality and integrity but not availability. There is no vendor advisory or patch currently available to address this issue.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of a user's browser session, potentially leading to information disclosure and integrity impacts. The vulnerability does not affect availability. No known exploits are reported 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 available, users should consider restricting access to the affected AJAX endpoints or applying web application firewall rules to detect and block suspicious input patterns related to this vulnerability.