Headline

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:

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.

21 hours ago

ghsa

Open in Source

#vulnerability #git #php #auth

GitHub Advisory Database
GitHub Reviewed
GHSA-98j6-67v3-mw34

Auth0 Symfony SDK Deserialization of Untrusted Data vulnerability

Critical severity GitHub Reviewed Published Jun 3, 2025 in auth0/symfony • Updated Jun 6, 2025

Package

composer auth0/symfony (Composer)

Affected versions

>= 5.0.0-BETA0, <= 5.0.0

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