CVE-2026-34236: Auth0/auth0 php Auth0 PHP SDK Has Insufficient Vulnerability

HIGH
Advisory Identifier: GHSA-w3wc-44p4-m4j7
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CVSS 8.2
CWE-331
Published
Advisory Summary

CVE-2026-34236 is a HIGH (CVSS 8.2) auth0 php sdk has insufficient vulnerability (CWE-331: Insufficient Entropy) affecting Auth0/auth0 php libraries in the Packagist ecosystem. The issue involves auth0 php sdk has insufficient entropy in cookie encryption. Remediation is available by upgrading affected packages to version 8.19.0.

CVE-2026-34236 at a Glance

CVE Identifier CVE-2026-34236
GHSA Identifier GHSA-w3wc-44p4-m4j7
Severity HIGH
CVSS v3.1 Base Score 8.2
CWE Classification CWE-331: Insufficient Entropy
Affected Product Auth0/auth0 php
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 CVE-2026-34236

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: 8.19.0 
Upgrade auth0/auth0-php to 8.19.0
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/auth0-php

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-34236, 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 8.19.0), 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/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

### 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: - Their application is using the Auth0-PHP SDK, versions between 8.0.0 and 8.18.0 - Their application is using the Auth0-PHP SDK, or the following SDKs that rely on the Auth0-PHP SDK: - Auth0/symfony, - Auth0/laravel0-auth0, or - Auth0/wordpress ### Resolution Upgrade Auth0/Auth0-PHP to version 8.19.0 or greater.

CVE-2026-34236 Affected Auth0/auth0 php Versions

1 component(s)
Fixed Versions:
8.19.0
Product / Package Ecosystem Affected Versions Fixed Version
auth0/auth0-php
 Packagist
≥ 8.0.0
< 8.19.0
8.19.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/auth0-PHP/security/advisories/GHSA-w3wc-44p4-m4j7
NVD — CVE-2026-34236 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34236
Auth0/auth0 php Source Repository REPOSITORY
https://github.com/auth0/auth0-PHP
Auth0/auth0 php Release RELEASE
https://github.com/auth0/auth0-PHP/releases/tag/8.19.0

Frequently Asked Questions

What is CVE-2026-34236?
CVE-2026-34236 is a security vulnerability in Auth0/auth0 php involving Auth0 PHP SDK has Insufficient Entropy in Cookie Encryption under CWE-331: Insufficient Entropy.
Which Auth0/auth0 php versions are affected?
Affected versions include releases prior to 8.19.0 across affected packages: auth0/auth0-php.
What version fixes CVE-2026-34236?
Upgrading to 8.19.0 (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 8.19.0. Upgrade your dependency to 8.19.0 or later.
What is the CVSS score of CVE-2026-34236?
CVE-2026-34236 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 CVE-2026-34236?
CVE-2026-34236 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 CVE-2026-34236?
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-w3wc-44p4-m4j7",
  "modified" : "2026-04-01T20:29:43Z",
  "published" : "2026-04-01T20:29:26Z",
  "aliases" : [ "CVE-2026-34236" ],
  "summary" : "Auth0 PHP 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- Their application is using the Auth0-PHP SDK, versions between 8.0.0 and 8.18.0\n- Their application is using the Auth0-PHP SDK, or the following SDKs that rely on the Auth0-PHP SDK:\n    - Auth0/symfony,\n    - Auth0/laravel0-auth0, or\n    - Auth0/wordpress\n\n### Resolution\nUpgrade Auth0/Auth0-PHP to version 8.19.0 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/auth0-php"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.19.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 8.18.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/auth0-PHP/security/advisories/GHSA-w3wc-44p4-m4j7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34236"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/auth0-PHP"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/auth0-PHP/releases/tag/8.19.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-331" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-01T20:29:26Z",
    "nvd_published_at" : "2026-04-01T18:16:30Z"
  }
}