CVE-2026-35057: Xenforo

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

XenForo before 2.3.10 and before 2.2.19 is vulnerable to stored cross-site scripting (XSS) in structured text mentions, primarily affecting legacy profile post content. An attacker can inject malicious scripts through crafted mentions that are stored and executed when other users view the content.

Affected products

• Xenforo Xenforo: before 2.2.19 (fixed in 2.2.19); from 2.3.0, before 2.3.10 (fixed in 2.3.10)

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