CVE-2026-35055CWE-79

XenForo Cross-Site Scripting via Lightbox in Posts

Medium · published April 1, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
17.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00266 · 17.5th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-04-01T00:30Z
EPSS history
Timeline
  • 01 APR 00:30Z
    XenForo Cross-Site Scripting via Lightbox in Posts
    cvelistv5