GHSA-f3r2-88mq-9v4g is a medium-severity (CVSS 6.8) vulnerability in auth0/symfony. A fix is available for auth0/symfony — see the affected versions and patch details below.
Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK
Real-World Exposure
auth0/symfonyReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Description
In applications built with the Auth0-PHP SDK, the audience validation in access tokens is performed improperly. Without proper validation, affected applications may accept ID tokens as Access tokens.
Affected product and versions
Projects are affected if they meet the following preconditions:
- Applications using the Auth0 Symfony SDK with versions between 5.0.0 and 5.5.0
- Auth0 Symfony SDK uses the Auth0-PHP SDK with versions between 8.0.0 and 8.17.0.
Resolution
Upgrade Auth0/symfony to version 5.6.0 or greater.
Acknowledgement
Okta would like to thank Jafar Sadiq (iaf4r) for their discovery and responsible disclosure.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | auth0/symfony | ≥ 5.0.0&&< 5.6.0 | 5.6.0composer require auth0/symfony:^5.6.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for auth0/symfony, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update auth0/symfony to 5.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f3r2-88mq-9v4g is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-f3r2-88mq-9v4g can be triaged on real exposure rather than presence alone.
Tailored to GHSA-f3r2-88mq-9v4g. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-f3r2-88mq-9v4g in your dependencies?
O3 Security finds GHSA-f3r2-88mq-9v4g across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.