GHSA-ghc5-95c2-vwcv: Auth0/symfony Auth0 Symfony SDK Has Insufficient Vulnerability

HIGH
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CVSS 8.2
CWE-331
Published
Advisory Summary

GHSA-ghc5-95c2-vwcv is a HIGH (CVSS 8.2) auth0 symfony sdk has insufficient vulnerability (CWE-331: Insufficient Entropy) affecting Auth0/symfony libraries in the Packagist ecosystem. The issue involves auth0 symfony sdk has insufficient entropy in cookie encryption. Remediation is available by upgrading affected packages to version 5.8.0.

GHSA-ghc5-95c2-vwcv at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-ghc5-95c2-vwcv
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-331: Insufficient Entropy
Affected Product Auth0/symfony
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.2

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:C/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 Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix GHSA-ghc5-95c2-vwcv

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: 5.8.0 
Upgrade auth0/symfony to 5.8.0
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-ghc5-95c2-vwcv, 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 5.8.0), 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-331: Insufficient Entropy, where the product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. 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

### Impact In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies. ### Am I Affected? Consumers are affected if their application meets the following preconditions: - It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0 - Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0. ### Resolution Upgrade Auth0/symfony-auth0 to version 5.8.0 or greater.

GHSA-ghc5-95c2-vwcv Affected Auth0/symfony Versions

1 component(s)
Fixed Versions:
5.8.0
Product / Package Ecosystem Affected Versions Fixed Version
auth0/symfony
 Packagist
≥ 5.0.0
< 5.8.0
5.8.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/symfony/security/advisories/GHSA-ghc5-95c2-vwcv
Auth0/symfony Source Repository REPOSITORY
https://github.com/auth0/symfony

Frequently Asked Questions

What is GHSA-ghc5-95c2-vwcv?
GHSA-ghc5-95c2-vwcv is a security vulnerability in Auth0/symfony involving Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption under CWE-331: Insufficient Entropy.
Which Auth0/symfony versions are affected?
Affected versions include releases prior to 5.8.0 across affected packages: auth0/symfony.
What version fixes GHSA-ghc5-95c2-vwcv?
Upgrading to 5.8.0 (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 5.8.0. Upgrade your dependency to 5.8.0 or later.
What is the CVSS score of GHSA-ghc5-95c2-vwcv?
GHSA-ghc5-95c2-vwcv has a CVSS v3.1 base score of 8.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.
What CWE is associated with GHSA-ghc5-95c2-vwcv?
GHSA-ghc5-95c2-vwcv is classified under CWE-331: Insufficient Entropy (The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.).
How can I check Packagist dependencies for GHSA-ghc5-95c2-vwcv?
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-ghc5-95c2-vwcv",
  "modified" : "2026-04-03T03:44:13Z",
  "published" : "2026-04-03T03:44:13Z",
  "aliases" : [ ],
  "summary" : "Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption",
  "details" : "### Impact\nIn applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.\n\n### Am I Affected?\nConsumers are affected if their application meets the following preconditions:\n- It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0\n- Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.\n\n### Resolution\nUpgrade Auth0/symfony-auth0 to version 5.8.0 or greater.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "auth0/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.8.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.7.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/security/advisories/GHSA-ghc5-95c2-vwcv"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/symfony"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-331" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-03T03:44:13Z",
    "nvd_published_at" : null
  }
}