GHSA-f3r2-88mq-9v4g
Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK
GHSA-f3r2-88mq-9v4g is a medium vulnerability (CVSS 6.8) in auth0/symfony, published December 17, 2025. No source lists public exploit code. Fixed in auth0/symfony 5.6.0.
- Severity
- 6.8 MediumCVSS 3.1, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
5.6.0auth0/symfony +1 more
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Affected packages
| Package | Affected | Fixed |
|---|---|---|
auth0/symfonyPackagist | 5.0.0 to 5.5.0 | 5.6.0 |
auth0/symfonyPackagist | 5.0.0 up to 5.6.0, plus listed versions 5.1.05.2.05.2.15.2.25.2.3 Show 5 moreShow less5.3.05.3.15.4.05.4.15.5.0 | 5.6.0 |
What each source reports
GitHub Advisories Score used
Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK
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.
- Record
GHSA-f3r2-88mq-9v4g- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-345, CWE-863, CWE-1395
- Updated
- 2026-11-02
OSV
Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK
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.
- Record
GHSA-f3r2-88mq-9v4g- CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-1395, CWE-345, CWE-863
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.