CVE-2026-35055 MEDIUM

CVE-2026-35055: XenForo Cross-Site Scripting via Lightbox in Posts

Vendor Xenforo
Product XenForo
Weakness CWE-79 · XSS
Published April 1, 2026
Last update May 24, 2026
View on NVD All CVEs

CVSS base score

5.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 1, 2026 CVE published
May 24, 2026 Record updated