CVE-2026-35055

5.1 mediumEPSS 0.2%

Medium (5.1) in xenforo xenforo. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

5.1 medium

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

CVSS 3.1

6.1 medium

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-04-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

xenforo:xenforo

References

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

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