GHSA-9wg9-93h9-j8ch: Auth0/symfony Remote Code Execution Vulnerability

CRITICAL
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CVSS 9.1
CWE-287
Published
Advisory Summary

GHSA-9wg9-93h9-j8ch is a CRITICAL (CVSS 9.1) remote code execution vulnerability (CWE-287: Improper Authentication) affecting Auth0/symfony libraries in the Packagist ecosystem. The issue involves auth0 symfony sdk vulnerable to brute force authentication tags of cookiestore sessions. Remediation is available by upgrading affected packages to version 5.4.0.

GHSA-9wg9-93h9-j8ch at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-9wg9-93h9-j8ch
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-287: Improper Authentication
Affected Product Auth0/symfony
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.1

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-9wg9-93h9-j8ch

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: 5.4.0 
Upgrade auth0/symfony to 5.4.0
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-9wg9-93h9-j8ch, 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 5.4.0), 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-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. 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

**Overview** Session cookies of applications using the Auth0 symfony SDK configured with CookieStore have authentication tags that can be brute forced, which may result in unauthorized access. **Am I Affected?** You are affected by this vulnerability if you meet the following pre-conditions: 1. Applications using the Auth0 symfony SDK with version <=5.3.1 2. Auth0/Symfony SDK uses the Auth0-PHP SDK with version 8.0.0-BETA1 or higher and below 8.14.0. 3. Session storage configured with CookieStore. **Fix** Upgrade Auth0/symfony to v5.4.0. As an additional precautionary measure, we recommend rotating your cookie encryption keys. Note that once updated, any previous session cookies will be rejected. **Acknowledgement** Okta would like to thank Félix Charette for discovering this vulnerability.

GHSA-9wg9-93h9-j8ch Affected Auth0/symfony Versions

1 component(s)
Fixed Versions:
5.4.0
Product / Package Ecosystem Affected Versions Fixed Version
auth0/symfony
 Packagist
< 5.4.0
5.4.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/symfony/security/advisories/GHSA-9wg9-93h9-j8ch
NVD — GHSA-9wg9-93h9-j8ch NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-47275
Security Fix Commit FIX COMMIT
https://github.com/auth0/symfony/commit/9a7294f08a32f17a0e77c8522a648195b6940340
Auth0/symfony Source Repository REPOSITORY
https://github.com/auth0/symfony
Auth0/symfony Release RELEASE
https://github.com/auth0/symfony/releases/tag/5.4.0

Frequently Asked Questions

What is GHSA-9wg9-93h9-j8ch?
GHSA-9wg9-93h9-j8ch is a security vulnerability in Auth0/symfony involving Auth0 Symfony SDK Vulnerable to Brute Force Authentication Tags of CookieStore Sessions under CWE-287: Improper Authentication.
Which Auth0/symfony versions are affected?
Affected versions include releases prior to 5.4.0 across affected packages: auth0/symfony.
What version fixes GHSA-9wg9-93h9-j8ch?
Upgrading to 5.4.0 (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 5.4.0. Upgrade your dependency to 5.4.0 or later.
What is the CVSS score of GHSA-9wg9-93h9-j8ch?
GHSA-9wg9-93h9-j8ch has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with GHSA-9wg9-93h9-j8ch?
GHSA-9wg9-93h9-j8ch is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Packagist dependencies for GHSA-9wg9-93h9-j8ch?
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-9wg9-93h9-j8ch",
  "modified" : "2025-05-17T15:06:54Z",
  "published" : "2025-05-17T15:06:54Z",
  "aliases" : [ ],
  "summary" : "Auth0 Symfony SDK Vulnerable to Brute Force Authentication Tags of CookieStore Sessions",
  "details" : "**Overview**\nSession cookies of applications using the Auth0 symfony SDK configured with CookieStore have authentication tags that can be brute forced, which may result in unauthorized access.\n\n**Am I Affected?**\nYou are affected by this vulnerability if you meet the following pre-conditions:\n1. Applications using the Auth0 symfony SDK with version <=5.3.1\n2. Auth0/Symfony SDK uses the Auth0-PHP SDK with version 8.0.0-BETA1 or higher and below 8.14.0. \n3. Session storage configured with CookieStore.\n\n\n**Fix**\nUpgrade Auth0/symfony to v5.4.0. As an additional precautionary measure, we recommend rotating your cookie encryption keys. Note that once updated, any previous session cookies will be rejected.\n\n**Acknowledgement**\nOkta would like to thank Félix Charette for discovering this vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "auth0/symfony"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/security/advisories/GHSA-9wg9-93h9-j8ch"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-47275"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/commit/9a7294f08a32f17a0e77c8522a648195b6940340"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/symfony"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/releases/tag/5.4.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-17T15:06:54Z",
    "nvd_published_at" : null
  }
}