CVE-2025-68129
📋 TL;DR
Auth0-PHP SDK versions 8.0.0 through 8.17.0 improperly validate audience claims in access tokens, allowing ID tokens to be accepted as access tokens. This affects applications using Auth0-PHP SDK directly or through Auth0's Symfony, Laravel, or WordPress integrations. Attackers could potentially bypass authentication or authorization controls.
💻 Affected Systems
- Auth0-PHP SDK
- Auth0/symfony
- Auth0/laravel-auth0
- Auth0/wordpress plugin
📦 What is this software?
Symfony by Auth0
⚠️ Risk & Real-World Impact
Worst Case
Authentication bypass leading to unauthorized access to protected resources, privilege escalation, or data exposure.
Likely Case
Authorization bypass where users access resources they shouldn't, potentially exposing sensitive data or functionality.
If Mitigated
Limited impact with proper additional validation layers, but still creates security gaps.
🎯 Exploit Status
Exploitation requires understanding of Auth0 token structure and ability to craft or modify tokens.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Auth0-PHP v8.18.0, Auth0/symfony v5.6.0, Auth0/laravel-auth0 v7.20.0, Auth0/wordpress plugin v5.5.0
Vendor Advisory: https://github.com/auth0/auth0-PHP/security/advisories/GHSA-j2vm-wrq3-f7gf
Restart Required: No
Instructions:
1. Update Auth0-PHP to v8.18.0 or later via composer update auth0/auth0-php. 2. For Symfony, update to v5.6.0+. 3. For Laravel, update to v7.20.0+. 4. For WordPress, update to v5.5.0+. 5. Test authentication flows after update.
🔧 Temporary Workarounds
Manual audience validation
allImplement custom validation to check token audience matches expected API identifier
🧯 If You Can't Patch
- Implement additional server-side validation of token type and audience claims
- Add rate limiting and monitoring for authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check composer.json or package.json for affected Auth0 SDK versions. Review code for token validation using Auth0-PHP SDK.Check Version:
composer show auth0/auth0-phpVerify Fix Applied:
Verify installed Auth0-PHP version is 8.18.0+ and test authentication with both valid and invalid tokens.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts with mismatched token types
- Unusual access patterns following authentication
Network Indicators:
- Authentication requests with unexpected token formats
SIEM Query:
auth0 token validation failure OR unexpected audience claim🔗 References
- https://github.com/auth0/auth0-PHP/commit/7fe700053aee609718460c123f00f53c511f0f7f
- https://github.com/auth0/auth0-PHP/releases/tag/8.18.0
- https://github.com/auth0/auth0-PHP/security/advisories/GHSA-j2vm-wrq3-f7gf
- https://github.com/auth0/laravel-auth0/commit/a1c3344dc0e5a36e8f56c8cfc535728d3d7558f3
- https://github.com/auth0/laravel-auth0/releases/tag/7.20.0
- https://github.com/auth0/laravel-auth0/security/advisories/GHSA-7hh9-gp72-wh7h
- https://github.com/auth0/symfony/commit/0103d6f8dcef6996653fad1f823d1c167f472479
- https://github.com/auth0/symfony/releases/tag/5.6.0
- https://github.com/auth0/symfony/security/advisories/GHSA-f3r2-88mq-9v4g
- https://github.com/auth0/wordpress/commit/b207c6f7fd06507b90c4e6bcc18a857ef9e018de
- https://github.com/auth0/wordpress/releases/tag/5.5.0
- https://github.com/auth0/wordpress/security/advisories/GHSA-vvg7-8rmq-92g7
