CVE-2026-35055
XenForo Cross-Site Scripting via Lightbox in Posts
- State
- Published
- Severity
- 5.1 Medium
- Published
- Apr 1, 2026
- Updated
- May 24, 2026
- Reserved
- Apr 1, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 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 | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
XenForoXenForo |
|
References
- XenForo 2.3.9 (inc XFMG) & 2.2.18 Released (Security Fix)vendor-advisorypatch
- VulnCheck Advisory: XenForo Cross-Site Scripting via Lightbox in Poststhird-party-advisory
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