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VulnerabilityPublished

CVE-2026-34236: auth0-PHP · Insufficient Entropy

Affects auth0-PHPSource CVE Database V5

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Not known to be exploited · CVSS 8.2 High : upgrade to 8.19.0 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 8.19.0
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade auth0-PHP and auth0/auth0-php to 8.19.0.

Affected software

ProductAffectedFixed in
auth0auth0-PHPAffected
  • >=8.0.0 <8.19.0
Fixed in
  • 8.19.0
Packagistauth0/auth0-phppkg:composer/auth0/auth0-phpOther threatsAffected
  • >=8.0.0 <8.19.0
Fixed in
  • 8.19.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Organizations should immediately upgrade all instances of Auth0-PHP SDK to version 8.19.0 or later, where the entropy issue has been resolved. In addition to upgrading, developers should review session management and cookie encryption practices to ensure adherence to cryptographic best practices, including using strong, cryptographically secure random number generators for key generation. Implementing additional layers of security such as multi-factor authentication (MFA) can reduce the impact of session hijacking. Monitoring for unusual session activity and implementing anomaly detection can help identify potential exploitation attempts. Where upgrading is not immediately possible, consider implementing compensating controls such as reducing session lifetimes, enforcing IP address or device fingerprint binding to sessions, and increasing logging and alerting on authentication anomalies. Regular security audits and penetration testing focused on session management can also help detect weaknesses. Finally, educate development teams on secure cryptographic practices to prevent similar issues in the future.

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.

References

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