Stored Cross-Site Scripting Vulnerability in XenForo by XenForo Ltd.
CVE-2026-35057

5.1MEDIUM

Key Information:

Vendor

Xen Projectforo

Status
Xen Projectforo
Vendor
CVE Published:
1 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-35057?

Legacy profile posts in XenForo versions prior to 2.3.10 and 2.2.19 are susceptible to stored cross-site scripting (XSS) attacks. This vulnerability allows attackers to inject malicious scripts through specially crafted mentions. When other users view this content, the scripts are executed within their browsers, potentially compromising their accounts and personal data. It is crucial for users to update to the latest versions to mitigate these risks.

Affected Version(s)

XenForo 2.3.0 < 2.3.10

XenForo 0 < 2.2.19

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-35057 - Proof of Concept

References

https://xenforo.com/community/threads/xenforo-2-3-10-add-...
vendor-advisorypatch
https://github.com/methosiea/xenforo-2-xss
exploit

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

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

metho
.