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CVE-2026-34236— Auth0 PHP SDK Insufficient Entropy in Cookie Encryption

Quick assessment

Affected
auth0 auth0-PHP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Auth0-PHP是Auth0开源的一个用于Auth0身份验证和管理API的PHP SDK。 Auth0-PHP 8.0.0至8.19.0之前版本存在安全特征问题漏洞，该漏洞源于使用熵不足的加密方式处理Cookie，可能导致威胁参与者暴力破解加密密钥并伪造会话Cookie。

CVSS 8.2 · High EPSS 0.32% · P23
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I. Basic Information for CVE-2026-34236

Vulnerability Information
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Vulnerability Title
Auth0 PHP SDK Insufficient Entropy in Cookie Encryption
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息熵不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Auth0-PHP 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Auth0-PHP是Auth0开源的一个用于Auth0身份验证和管理API的PHP SDK。 Auth0-PHP 8.0.0至8.19.0之前版本存在安全特征问题漏洞，该漏洞源于使用熵不足的加密方式处理Cookie，可能导致威胁参与者暴力破解加密密钥并伪造会话Cookie。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
auth0 auth0-PHP >= 8.0.0, < 8.19.0 -

II. Public POCs for CVE-2026-34236

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9531 chars
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III. Intelligence Information for CVE-2026-34236

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Vendor Advisories for CVE-2026-34236 (1)

Vendor Pages for CVE-2026-34236 (1)

IV. Related Vulnerabilities

Same product: auth0-PHP
Same vendor: auth0
Same weakness: CWE-331

V. Comments for CVE-2026-34236

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