GHSA-v9m8-9xxp-q492
Auth0-PHP SDK Deserialization of Untrusted Data vulnerability
Quick fix
GHSA-v9m8-9xxp-q492 — auth0/auth0-php: upgrade to the fixed version with the command below.
composer require auth0/auth0-php:^8.3.1Details
**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. Applications using the Auth0-PHP SDK, versions between 8.0.0-BETA3 to 8.3.0. 2. 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.
Are you affected?
Enter the version of the package you're using.
Affected packages
8.0.0-BETA3Fixed in: 8.3.1composer require auth0/auth0-php:^8.3.1References
- https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492[WEB]
- https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q[WEB]
- https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34[WEB]
- https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-48951[ADVISORY]
- https://github.com/auth0/auth0-PHP/commit/04b1f5daa8bdfebc5e740ec5ca0fb2df1648a715[WEB]
- https://github.com/auth0/auth0-PHP[PACKAGE]