GHSA-f3r2-88mq-9v4g: Auth0/symfony Auth0 Symfony SDK Has Improper Vulnerability

MODERATE
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CVSS 6.8
CWE-1395 CWE-345 CWE-863
Published
Advisory Summary

GHSA-f3r2-88mq-9v4g is a MODERATE (CVSS 6.8) auth0 symfony sdk has improper vulnerability (CWE-1395: Dependency on Vulnerable Third-Party Component) affecting Auth0/symfony libraries in the Packagist ecosystem. The issue involves auth0 symfony sdk has improper audience validation via auth0-php sdk. Remediation is available by upgrading affected packages to version 5.6.0.

GHSA-f3r2-88mq-9v4g at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-f3r2-88mq-9v4g
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-1395: Dependency on Vulnerable Third-Party Component
Affected Product Auth0/symfony
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix GHSA-f3r2-88mq-9v4g

To remediate this vulnerability, upgrade all affected Auth0/symfony dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

auth0/symfony fixed: 5.6.0 
Upgrade auth0/symfony to 5.6.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for auth0/symfony

How to Check if You Are Affected

To determine whether your application is affected by GHSA-f3r2-88mq-9v4g, inspect your project dependencies for Auth0/symfony:

inspect dependencies for auth0/symfony

Analyze the terminal output to locate any version of Auth0/symfony in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.6.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1395: Dependency on Vulnerable Third-Party Component, where the product has a dependency on a third-party component that contains one or more known vulnerabilities. In Auth0/symfony, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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.

GHSA-f3r2-88mq-9v4g Affected Auth0/symfony Versions

1 component(s)
Fixed Versions:
5.6.0
Product / Package Ecosystem Affected Versions Fixed Version
auth0/symfony
 Packagist
≥ 5.0.0
< 5.6.0
5.6.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/symfony/security/advisories/GHSA-f3r2-88mq-9v4g
Security Fix Commit FIX COMMIT
https://github.com/auth0/symfony/commit/0103d6f8dcef6996653fad1f823d1c167f472479
Auth0/symfony Source Repository REPOSITORY
https://github.com/auth0/symfony
Auth0/symfony Release RELEASE
https://github.com/auth0/symfony/releases/tag/5.6.0

Frequently Asked Questions

What is GHSA-f3r2-88mq-9v4g?
GHSA-f3r2-88mq-9v4g is a security vulnerability in Auth0/symfony involving Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK under CWE-1395: Dependency on Vulnerable Third-Party Component.
Which Auth0/symfony versions are affected?
Affected versions include releases prior to 5.6.0 across affected packages: auth0/symfony.
What version fixes GHSA-f3r2-88mq-9v4g?
Upgrading to 5.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is auth0/symfony affected?
Yes, auth0/symfony is affected in releases prior to 5.6.0. Upgrade your dependency to 5.6.0 or later.
What is the CVSS score of GHSA-f3r2-88mq-9v4g?
GHSA-f3r2-88mq-9v4g has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with GHSA-f3r2-88mq-9v4g?
GHSA-f3r2-88mq-9v4g is classified under CWE-1395: Dependency on Vulnerable Third-Party Component (The product has a dependency on a third-party component that contains one or more known vulnerabilities.).
How can I check Packagist dependencies for GHSA-f3r2-88mq-9v4g?
Run the dependency tree command: 'inspect dependencies for auth0/symfony'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-f3r2-88mq-9v4g",
  "modified" : "2025-12-17T20:56:37Z",
  "published" : "2025-12-17T20:56:37Z",
  "aliases" : [ ],
  "summary" : "Auth0 Symfony SDK has Improper Audience Validation via Auth0-PHP SDK",
  "details" : "### Description\nIn 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.\n\n### Affected product and versions\nProjects are affected if they meet the following preconditions:\n\n- Applications using the Auth0 Symfony SDK with versions between 5.0.0 and 5.5.0\n- Auth0 Symfony SDK uses the Auth0-PHP SDK with versions between 8.0.0 and 8.17.0.\n\n### Resolution\nUpgrade Auth0/symfony to version 5.6.0 or greater.\n\n### Acknowledgement\nOkta would like to thank Jafar Sadiq (iaf4r) for their discovery and responsible disclosure.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "auth0/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.6.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.5.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/security/advisories/GHSA-f3r2-88mq-9v4g"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/commit/0103d6f8dcef6996653fad1f823d1c167f472479"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/symfony"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/releases/tag/5.6.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1395", "CWE-345", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-17T20:56:37Z",
    "nvd_published_at" : null
  }
}