CVE-2026-34236
Auth0 PHP SDK Insufficient Entropy in Cookie Encryption
CVE-2026-34236 is a high vulnerability (CVSS 8.2) in Auth0 Auth0-php, published April 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 13th percentile. Fixed in auth0/auth0-php 8.19.0.
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Auth0 PHP SDK Insufficient Entropy in Cookie Encryption
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.
- Record
CVE-2026-34236- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
EUVDEUVD-2026-17979
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.
- Record
EUVD-2026-17979- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-w3wc-44p4-m4j7
Auth0 PHP SDK has Insufficient Entropy in Cookie Encryption
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.
- Record
GHSA-w3wc-44p4-m4j7- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-34236- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-331
- Updated
- 2026-11-02
OSV
Auth0 PHP SDK Insufficient Entropy in Cookie Encryption
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.
- Record
CVE-2026-34236- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
OSVGHSA-w3wc-44p4-m4j7
Auth0 PHP SDK has Insufficient Entropy in Cookie Encryption
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.
- Record
GHSA-w3wc-44p4-m4j7- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
auth0/auth0-phpPackagist |
8.0.0 to 8.18.0 | 8.19.0 |
auth0/auth0-phpPackagist |
8.0.0 up to 8.19.0, plus listed versions 8.0.18.0.28.0.38.0.48.0.5 Show 32 moreShow less8.0.68.1.08.10.08.11.08.11.18.12.08.13.08.14.08.15.08.16.08.17.08.18.08.2.08.2.18.3.08.3.18.3.28.3.38.3.48.3.58.3.68.3.78.3.88.4.08.5.08.6.08.7.08.7.18.8.08.9.08.9.18.9.3 |
8.19.0 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD, OSV |