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Not in CISA KEV
HIGH severity

CVE-2026-34236 — auth0-php

HIGH

CVE-2026-34236 is a high-severity (CVSS 8.2) CWE-331 vulnerability in auth0/auth0-php. A fix is available for auth0/auth0-php — see the affected versions and patch details below.

Auth0 PHP SDK Insufficient Entropy in Cookie Encryption

Also known asGHSA-w3wc-44p4-m4j7
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-34236.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs13th percentile — riskier than 13% of all scored CVEsHighest risk
0.00%0.27%0.55%0.82%0.0%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘auth0/auth0-php

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistauth0/auth0-php≥ 8.0.0&&< 8.19.08.19.0composer require auth0/auth0-php:^8.19.0

Affected Products

1 product · 1 configurations
Application
auth0-phpauth0
≥ 8.0.0 && < 8.19.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for auth0/auth0-php, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update auth0/auth0-php to 8.19.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-34236 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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 t
O3 Security · Impact-Aware SCA

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CVE-2026-34236: auth0-php — Fixed in 8.19.0