CVE-2025-48951: Auth0-PHP SDK Deserialization of Untrusted Data vulnerability
Overview The Auth0 PHP SDK contains 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. Am I Affected? You are affected by this vulnerability if you meet the following preconditions: 1.
Published Jun 4, 2025
Affected packages
auth0/auth0-php
- Ecosystem
- Composer (PHP)
- Affected
- >= 8.0.0-BETA3, < 8.3.1
- Fixed in
- 8.3.1
- Check
composer show auth0/auth0-php
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
Overview The Auth0 PHP SDK contains 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.
Am I Affected? You are affected by this vulnerability if you meet the following preconditions:
- Applications using the Auth0-PHP SDK, versions between 8.0.0-BETA3 to 8.3.0.
- Applications using the following SDKs that rely on the Auth0-PHP SDK versions between 8.0.0-BETA3 to 8.3.0: a. Auth0/symfony, b. Auth0/laravel-auth0, c. Auth0/wordpress.
Fix Upgrade Auth0/Auth0-PHP to 8.3.1.
Acknowledgement Okta would like to thank Andreas Forsblom for discovering this vulnerability.
References
- https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492
- https://nvd.nist.gov/vuln/detail/CVE-2025-48951
- https://github.com/auth0/auth0-PHP/commit/04b1f5daa8bdfebc5e740ec5ca0fb2df1648a715
- 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
- https://github.com/advisories/GHSA-v9m8-9xxp-q492
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology