CVE-2026-35055

MEDIUM

XenForo Cross-Site Scripting via Lightbox in Posts

Title source: cna

Description

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.

References (2)

[Vendor Advisory] https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-fix.235659/

[Third Party Advisory] https://www.vulncheck.com/advisories/xenforo-cross-site-scripting-via-lightbox-in-posts

Scores

CVSS v3 6.1

EPSS 0.0003

EPSS Percentile 9.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE

CWE-79

Status published

Products (3)

XenForo/XenForo < 2.2.18

xenforo/xenforo < 2.2.18

XenForo/XenForo 2.3.0 - 2.3.9

Published Apr 01, 2026

Tracked Since Apr 01, 2026