CVE-2026-34236

Name: CVE-2026-34236
Creator: NVD / NIST
Published: 2026-04-01T18:16:30.007+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2026-34236 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.22%

12.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-331

Affected Software

Vendor	Product	Versions
Auth0	Auth0-Php	>= 8.0.0, < 8.19.0

References

https://github.com/auth0/auth0-PHP/releases/tag/8.19.0Product, Release Notes
https://github.com/auth0/auth0-PHP/security/advisories/GHSA-w3wc-44p4-m4j7Vendor Advisory

Timeline

Published: Apr 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34236?

How severe is CVE-2026-34236?

CVE-2026-34236 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34236?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34236?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST