CVE-2026-2736: Alkacon Opencms

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Reflected Cross-site Scripting (XSS) in Alkacon's OpenCms v18.0, which allows an attacker to execute JavaScript code in the victim's browser by sending the victim a malicious URL containing the ‘q’ parameter in ‘/search/index.html’. This vulnerability can be exploited to steal sensitive user information such as session cookies, or to perform actions while impersonating the user.

Affected products

• Alkacon Opencms: version 18.0.0 only

Published 2026-02-19. Last modified 2026-06-17.