CVE-2026-35055

MediumCVSS 6.1/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
XenForo	XenForo	>= 2.3.0, < 2.3.9; < 2.2.18

References

https://www.vulncheck.com/advisories/xenforo-cross-site-scripting-via-lightbox-in-postsThird Party Advisory
https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-fix.235659/Release Notes

Timeline

Published: Apr 1, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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