CVE-2026-35055

XenForo before 2.3.9 and before 2.2.18 is vulnerable to cross-site scripting (XSS) related to lightbox usage in posts. An attacker can inject malicious scripts that execute when users interact with post content displayed in the lightbox.

More information : https://www.vulncheck.com/advisories/xenforo-cross-site-scripting-via-lightbox-in-posts