Authentication Bypass in XenForo Passkey Implementation Before

Impact Analysis

This vulnerability can have a severe impact by allowing unauthorized attackers to bypass Passkey authentication controls, potentially gaining access to user accounts. The impact affects confidentiality, integrity, and availability of the affected system, meaning sensitive information could be exposed, altered, or the service could be disrupted.

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Mitigation Strategies

To mitigate CVE-2025-71279, you should immediately upgrade XenForo to version 2.3.7 or later, as this release contains the necessary security fixes addressing the Passkey authentication vulnerability.

If a full upgrade is not immediately possible, applying the provided patch file (237-patch.zip) is recommended, though a full upgrade is preferred.

Additionally, review and refactor any database queries embedded directly within templates, as these are deprecated and will be disallowed in future releases. Errors related to this will now be logged in the server error log.

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Compliance Impact

The provided information does not specify how CVE-2025-71279 affects compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

CVE-2025-71279 is a critical security vulnerability affecting XenForo versions prior to 2.3.7. It involves a flaw in the Passkey-based authentication mechanism, where an attacker can bypass security controls on Passkeys added to user accounts. This means the attacker may be able to compromise the authentication process without needing any privileges or user interaction.

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