GHSA-98j6-67v3-mw34: Auth0 Symfony SDK Deserialization of Untrusted Data vulnerability
Overview The Auth0 Symfony SDK contains a critical 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 6, 2025
Affected packages
auth0/symfony
- Ecosystem
- Composer (PHP)
- Affected
- >= 5.0.0-BETA0, <= 5.0.0
- Fixed in
- 5.1.0
- Check
composer show auth0/symfony
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
Overview The Auth0 Symfony SDK contains a critical 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 Symfony SDK, versions between 5.0.0 BETA-0 to 5.0.0.
- Auth0 Symfony SDK uses the Auth0-PHP SDK with version 8.0.0-BETA3 to 8.3.0.
Fix Upgrade Auth0/symfony to the latest version (v5.4.0).
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://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://nvd.nist.gov/vuln/detail/CVE-2025-48951
- https://github.com/advisories/GHSA-98j6-67v3-mw34
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