CVE-2026-34236: AUTH0 AUTH0-PHP

Critical severity, CVSS 9.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• AUTH0 AUTH0-PHP: from 8.0.0, before 8.19.0 (fixed in 8.19.0)

Published 2026-04-01. Last modified 2026-06-17.