XenForo up to 2.2.17/2.3.8 code injection

Summaryinfo

A vulnerability categorized as critical has been discovered in XenForo up to 2.2.17/2.3.8. This vulnerability affects unknown code. Executing a manipulation can lead to code injection. The identification of this vulnerability is CVE-2026-35056. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in XenForo up to 2.2.17/2.3.8. It has been declared as critical. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.

The weakness was shared by UwU. The advisory is shared for download at xenforo.com. This vulnerability was named CVE-2026-35056 since 04/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 2.2.18 or 2.3.9 eliminates this vulnerability.

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Productinfo

Name

• XenForo

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11
• 2.2.12
• 2.2.13
• 2.2.14
• 2.2.15
• 2.2.16
• 2.2.17
• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.3.7
• 2.3.8

CPE 2.3info

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CPE 2.2info

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