Vulnerability · Published Apr 1, 2026 · Assigned by VulnCheck
CVE-2026-35054XenForo Stored Cross-Site Scripting via BB Code Rendering
Medium 6.4
In plain English
A medium-severity cross-site scripting in XenForo from XenForo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).
Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.1%top 96.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
References
- XenForo 2.3.9 (inc XFMG) & 2.2.18 Released (Security Fix) vendor-advisory, patch
- VulnCheck Advisory: XenForo Stored Cross-Site Scripting via BB Code Rendering third-party-advisory