CVE-2026-35054: Xenforo

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

XenForo before 2.3.9 is vulnerable to stored cross-site scripting (XSS) related to BB code rendering. An attacker can inject malicious scripts through BB code that are stored and executed when other users view the content.

Affected products

• Xenforo Xenforo: before 2.3.9 (fixed in 2.3.9)

Published 2026-04-01. Last modified 2026-06-17.