Auth0 Wordpress Plugin vulnerable to Deserialization of Untrusted Data

CRITICALGHSA-862m-5253-832r · Published 05/06/2025 · updated 04/02/2026

In short

GHSA-862m-5253-832r is a CRITICAL vulnerability affecting auth0/wordpress.
Fix: update to 5.1.0 or later.

Package	Affected versions	Patched versions
auth0/wordpress Packagist	`≥ 5.0.0-BETA0, < 5.1.0`	`5.1.0`

Description

Overview The Auth0 Wordpress plugin 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 WordPress plugin, versions between 5.0.0 BETA-0 to 5.0.1.
Auth0 WordPress plugin uses the Auth0-PHP SDK with version 8.0.0-BETA3 to 8.3.0.

Fix Upgrade the Auth0 WordPress plugin to the latest version (v5.3.0).

References

auth0/auth0-PHP security advisory · WEB
auth0/laravel-auth0 security advisory · WEB
auth0/symfony security advisory · WEB
auth0/wordpress security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2025-48951 · ADVISORY
auth0/wordpress · PACKAGE

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Package

Affected versions

Patched versions

auth0/wordpress

Packagist

≥ 5.0.0-BETA0, < 5.1.0

5.1.0

Description

Am I Affected? You are affected by this vulnerability if you meet the following preconditions:

Applications using the Auth0 WordPress plugin, versions between 5.0.0 BETA-0 to 5.0.1.
Auth0 WordPress plugin uses the Auth0-PHP SDK with version 8.0.0-BETA3 to 8.3.0.

Fix Upgrade the Auth0 WordPress plugin to the latest version (v5.3.0).

More vulnerabilities in auth0/wordpress

See all →