Overview
The CVE-2025-47275 vulnerability reveals a significant security flaw in the Auth0-PHP SDK, which provides the PHP Software Development Kit for Auth0 Authentication and Management APIs. This vulnerability, which exists in versions 8.0.0-BETA1 to 8.14.0, can lead to unauthorized access due to brute force attacks on session cookies’ authentication tags. This vulnerability primarily affects applications using the Auth0-PHP SDK, including those utilizing Auth0/symfony, Auth0/laravel-auth0, and Auth0/wordpress SDKs that are configured with CookieStore. The severity of this vulnerability underscores the importance of cybersecurity vigilance and the need for immediate attention and mitigation.
Vulnerability Summary
CVE ID: CVE-2025-47275
Severity: Critical (9.1 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized access, potential system compromise or data leakage.
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Product | Affected Versions
Auth0-PHP SDK | 8.0.0-BETA1 to 8.14.0
Auth0/symfony | All versions relying on Auth0-PHP SDK
Auth0/laravel-auth0 | All versions relying on Auth0-PHP SDK
Auth0/wordpress | All versions relying on Auth0-PHP SDK
How the Exploit Works
The vulnerability leverages the weakness in the authentication tags of session cookies used by the affected SDKs. An attacker can use a brute force method to guess these authentication tags, thus gaining unauthorized access to the system or application. The attack can be carried out remotely and does not require any user interaction or special privileges.
Conceptual Example Code
This is a simplified, conceptual example of how an attack might be carried out. In this scenario, an attacker sends a series of requests with different session cookies until the correct authentication tag is hit:
POST /api/endpoint HTTP/1.1
Host: target.example.com
Cookie: sessionid=attackers_generated_cookie
{ "payload": "..." }In the above example, `attackers_generated_cookie` would be iteratively updated with a series of potential session cookies until the system is fooled into granting access.
Mitigation Guidance
To mitigate this vulnerability, users are advised to immediately upgrade to Auth0/Auth0-PHP v8.14.0 or later, which includes a patch for this issue. Furthermore, as an extra precaution, it is recommended to rotate cookie encryption keys regularly. In the interim, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.