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CVE-2025-48951 — Vulnerability in auth0/auth0-php — CVE Details

CRITICAL

Auth0-PHP SDK Deserialization of Untrusted Data vulnerability

Published June 4, 2025Updated February 4, 2026Source: osv

Summary

**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.

Advisory Timeline

  • First published June 4, 2025 (495 days ago).
  • Last revised February 4, 2026 — 244 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update auth0/auth0-php to 8.3.1 or later
composer require "auth0/auth0-php:^8.3.1"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
auth0/auth0-php
packagist
8.0.0, 8.0.0-BETA3, 8.0.1, 8.0.2 (+8 more)8.3.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2025-48951?
Auth0-PHP SDK Deserialization of Untrusted Data vulnerability This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2025-48951?
CVE-2025-48951 affects auth0/auth0-php. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-48951 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-v9m8-9xxp-q492

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