CVE-2025-48951: Auth0/auth0 php Auth0-PHP SDK Deserialization Of Untrusted Vulnerability

CRITICAL
Advisory Identifier: GHSA-v9m8-9xxp-q492
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CWE-502
Published
Advisory Summary

CVE-2025-48951 is a CRITICAL auth0-php sdk deserialization of untrusted vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Auth0/auth0 php libraries in the Packagist ecosystem. The issue involves auth0-php sdk deserialization of untrusted data vulnerability. Remediation is available by upgrading affected packages to version 8.3.1.

CVE-2025-48951 at a Glance

CVE Identifier CVE-2025-48951
GHSA Identifier GHSA-v9m8-9xxp-q492
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Auth0/auth0 php
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2025-48951

To remediate this vulnerability, upgrade all affected Auth0/auth0 php 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/auth0-php fixed: 8.3.1 
Upgrade auth0/auth0-php to 8.3.1
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/auth0-php

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-48951, inspect your project dependencies for Auth0/auth0 php:

inspect dependencies for auth0/auth0-php

Analyze the terminal output to locate any version of Auth0/auth0 php in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.3.1), 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Auth0/auth0 php, 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** The Auth0 PHP SDK contains a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. **Am I Affected?** You are affected by this vulnerability if you meet the following preconditions: 1. Applications using the Auth0-PHP SDK, versions between 8.0.0-BETA3 to 8.3.0. 2. Applications using the following SDKs that rely on the Auth0-PHP SDK versions between 8.0.0-BETA3 to 8.3.0: a. Auth0/symfony, b. Auth0/laravel-auth0, c. Auth0/wordpress. **Fix** Upgrade Auth0/Auth0-PHP to 8.3.1. **Acknowledgement** Okta would like to thank Andreas Forsblom for discovering this vulnerability.

CVE-2025-48951 Affected Auth0/auth0 php Versions

1 component(s)
Fixed Versions:
8.3.1
Product / Package Ecosystem Affected Versions Fixed Version
auth0/auth0-php
 Packagist
≥ 8.0.0-BETA3
< 8.3.1
8.3.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492
GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q
GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34
GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r
NVD — CVE-2025-48951 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-48951
Security Fix Commit FIX COMMIT
https://github.com/auth0/auth0-PHP/commit/04b1f5daa8bdfebc5e740ec5ca0fb2df1648a715
Auth0/auth0 php Source Repository REPOSITORY
https://github.com/auth0/auth0-PHP

Frequently Asked Questions

What is CVE-2025-48951?
CVE-2025-48951 is a security vulnerability in Auth0/auth0 php involving Auth0-PHP SDK Deserialization of Untrusted Data vulnerability under CWE-502: Deserialization of Untrusted Data.
Which Auth0/auth0 php versions are affected?
Affected versions include releases prior to 8.3.1 across affected packages: auth0/auth0-php.
What version fixes CVE-2025-48951?
Upgrading to 8.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is auth0/auth0-php affected?
Yes, auth0/auth0-php is affected in releases prior to 8.3.1. Upgrade your dependency to 8.3.1 or later.
What CWE is associated with CVE-2025-48951?
CVE-2025-48951 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Packagist dependencies for CVE-2025-48951?
Run the dependency tree command: 'inspect dependencies for auth0/auth0-php'. 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-v9m8-9xxp-q492",
  "modified" : "2025-06-04T22:56:42Z",
  "published" : "2025-06-04T20:31:39Z",
  "aliases" : [ "CVE-2025-48951" ],
  "summary" : "Auth0-PHP SDK Deserialization of Untrusted Data vulnerability",
  "details" : "**Overview**\nThe Auth0 PHP SDK contains a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data.\n\n**Am I Affected?**\nYou are affected by this vulnerability if you meet the following preconditions:\n\n1. Applications using the Auth0-PHP SDK, versions between 8.0.0-BETA3 to 8.3.0. \n2. Applications using the following SDKs that rely on the Auth0-PHP SDK versions between 8.0.0-BETA3 to 8.3.0:\n    a. Auth0/symfony,\n    b. Auth0/laravel-auth0,\n    c. Auth0/wordpress.\n\n**Fix**\nUpgrade Auth0/Auth0-PHP to 8.3.1.\n\n**Acknowledgement**\nOkta would like to thank Andreas Forsblom for discovering this vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "auth0/auth0-php"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0-BETA3"
      }, {
        "fixed" : "8.3.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-48951"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/auth0-PHP/commit/04b1f5daa8bdfebc5e740ec5ca0fb2df1648a715"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/auth0-PHP"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-06-04T20:31:39Z",
    "nvd_published_at" : "2025-06-03T21:15:21Z"
  }
}