Executive Summary

CVE-2025-71281 is a high-severity vulnerability affecting XenForo versions before 2.3.7. It occurs because XenForo improperly restricts which methods can be called from within templates. Instead of using a strict first-word match to limit accessible methods, it uses a loose prefix match. This flaw allows unauthorized method invocations through callbacks and variable method calls in templates, potentially enabling code injection.

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Impact Analysis

This vulnerability can have serious impacts including unauthorized code execution within the XenForo application. Because it allows unauthorized method calls, an attacker could potentially execute arbitrary code, leading to compromise of confidentiality, integrity, and availability of the system. The CVSS score indicates high impact on these security aspects, and the attack can be performed remotely with low complexity and without user interaction.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade XenForo to version 2.3.7 or later, where the issue with template method call restriction bypass has been fixed.

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Compliance Impact

The vulnerability in XenForo before version 2.3.7 allows unauthorized method invocations through templates, potentially leading to code injection with high impacts on confidentiality, integrity, and availability. Such impacts can affect compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and system integrity.

Specifically, the high severity and potential for unauthorized access and code execution could lead to breaches of personal or protected health information, thereby violating data protection requirements under these regulations.

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