auth0 Auth0-PHP up to 8.13.x Cookie deserialization

Summaryinfo

A vulnerability identified as critical has been detected in auth0 Auth0-PHP up to 8.13.x. Affected by this vulnerability is an unknown functionality of the component Cookie Handler. This manipulation causes deserialization. This vulnerability is tracked as CVE-2025-48951. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in auth0 Auth0-PHP up to 8.13.x. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Cookie Handler. The manipulation with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.14.0 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.14.0 contains a patch for the issue.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-48951 since 05/28/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 8.14.0 eliminates this vulnerability. Applying the patch 52a79480fdb246f59dbc089b81a784ae049bd389 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-16787). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Programming Language Software

Vendor

• auth0

Name

• Auth0-PHP

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13

License

• open-source

Website

• Product: https://github.com/auth0/auth0-PHP/

CPE 2.3info

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Be aware that VulDB is the high quality source for vulnerability data.

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