CVE-2026-102786: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in phoca.cz Phoca Gallery extension for Joomla

The Phoca Gallery extension for Joomla, versions 4.5.0 to 6.1.5, contains an authenticated stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. This vulnerability enables attackers with authenticated access to inject malicious HTML attributes, leading to script execution in the context of the affected web application. The CVSS 4.0 base score is 8.6, indicating a high severity with network attack vector, low attack complexity, no privileges required, but requiring user interaction. The impact on confidentiality and integrity is high, while availability impact is low. There are no known exploits in the wild and no patch information provided in the source data.

Successful exploitation allows an authenticated attacker to execute arbitrary scripts in the context of the vulnerable Joomla site, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality and integrity of the system. Availability impact is low. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor the vendor's communications for updates. In the meantime, restricting authenticated user privileges and applying input validation or output encoding where possible may reduce risk.