CVE-2026-34236: Auth0 PHP SDK has Insufficient Entropy in Cookie Encryption

CVE-2026-34236 · Severity: high · CVSS 8.2 · Published 2026-04-01

Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. From version 8.0.0 to before version 8.19.0, 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. This issue has been patched in version 8.19.0.

Technologies: auth0/auth0-php (Packagist). Vendors: Auth0, Packagist.

Quick answers

Is CVE-2026-34236 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-34236 being exploited in the wild.
How severe is CVE-2026-34236?
High severity, with a CVSS score of 8.2, published 1 April 2026.
Which products and versions are affected?
auth0/auth0-php (Packagist) ECOSYSTEM:introduced=8.0.0,fixed=8.19.0.
Is there a fix for CVE-2026-34236?
Yes. auth0/auth0-php (Packagist): upgrade to 8.19.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-34236?
Check whether you run Auth0-Php or auth0/auth0-php (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • auth0/auth0-php (Packagist): upgrade to 8.19.0 or later
    composer require auth0/auth0-php:^8.19.0

Affected products

  • Auth0-Php
  • auth0/auth0-php (Packagist) ECOSYSTEM:introduced=8.0.0,fixed=8.19.0

Identifiers

  • CVE-2026-34236
  • GHSA-w3wc-44p4-m4j7

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