PT-2026-29430 · Xenforo · Xenforo

Published 2026-04-01 · Updated 2026-04-01 · CVE-2026-35055

NVD

CVSS v3.1

6.1

Medium

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-35055

Affected Products

Xenforo

References · 3

• https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-fix.235659 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35055 · Security Note
• https://vulncheck.com/advisories/xenforo-cross-site-scripting-via-lightbox-in-posts · Note