CVE-2026-35054CWE-79

XenForo Stored Cross-Site Scripting via BB Code Rendering

Medium · published April 1, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
14.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00237 · 14.0th 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 Stored Cross-Site Scripting via BB Code Rendering
    cvelistv5