CVE-2026-35054
XenForo Stored Cross-Site Scripting via BB Code Rendering
- State
- Published
- Severity
- 5.1 Medium
- Published
- Apr 1, 2026
- Updated
- May 24, 2026
- Reserved
- Apr 1, 2026
Description
XenForo before 2.3.9 is vulnerable to stored cross-site scripting (XSS) related to BB code rendering. An attacker can inject malicious scripts through BB code that are stored and executed when other users view the content.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 Stored Cross-Site Scripting via BB Code Renderingthird-party-advisory
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