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CVE-2025-48951: Auth0-PHP SDK Deserialization of Untrusted Data vulnerability

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-03 · updated 2026-06-17
• Weakness: CWE-502

Description

Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 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 8.3.1 contains a patch for the issue.

Affected products

• auth0-PHP: from 8.0.0-BETA3, < 8.3.1

References

• https://github.com/auth0/auth0-PHP/commit/04b1f5daa8bdfebc5e740ec5ca0fb2df1648a715
• https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492
• https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q
• https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34
• https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r

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