Stored Cross-Site Scripting Vulnerability in XenForo by XenForo Limited
CVE-2026-35054

5.1MEDIUM

Key Information:

Vendor

Xen Projectforo

Status
Xen Projectforo
Vendor
CVE Published:
1 April 2026

What is CVE-2026-35054?

XenForo versions before 2.3.9 are susceptible to a stored cross-site scripting (XSS) vulnerability associated with BB code rendering. This security weakness allows attackers to embed malicious scripts within BB code. Once stored, these scripts execute when unsuspecting users view the affected content, potentially compromising user data and session integrity. It is essential for administrators to update to the latest version to safeguard their platforms against exploitation.

Affected Version(s)

XenForo 2.3.0 < 2.3.9

References

https://xenforo.com/community/threads/xenforo-2-3-9-inc-x...
vendor-advisorypatch
https://www.vulncheck.com/advisories/xenforo-stored-cross...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Antisocial
.