CVE-2026-35055

MEDIUM EPSS 5.0%

Published Apr 1, 20263mo ago · Modified Jun 17, 20262w ago

5.1 CVSS 4.0

Medium

Published Apr 1, 2026 3mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

5.1

Exploitability

—

Impact

—

Vector string

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction A

Scope X

Threat Intelligence

EPSS Exploit Probability

5.0% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 2

Vendor	Product	Version	Range
xenforo	xenforo	*	<2.2.18
xenforo	xenforo	*	≥2.3.0 – <2.3.9

References 2

vulncheck.com https://www.vulncheck.com/advisories/xenforo-cross-site-scripting-via-lightbox-in-posts

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

Release Notes

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.