HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-67336 — better-auth versions before 1.6.11 contain insecure cryptographic defaults in th...

·Source: NIST NVD

Updated:

Executive Summary

better-auth versions before 1.6.11 contain insecure cryptographic defaults in the oidcProvider and mcp plugins that advertise the none algorithm and accept plain PKCE by default. Attackers can exploit algorithm negotiation to accept unsigned tokens or intercept authorization codes when PKCE plain is used instead of the required S256 method.

Analysis

better-auth versions before 1.6.11 contain insecure cryptographic defaults in the oidcProvider and mcp plugins that advertise the none algorithm and accept plain PKCE by default. Attackers can exploit algorithm negotiation to accept unsigned tokens or intercept authorization codes when PKCE plain is used instead of the required S256 method. CVSS Score: 8.7. Published: 2026-08-01T13:17:04.557.

Indicators of Compromise (1)

CVE (1)
CVE-2026-67336
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Aug 1, 2026. Verified by: NIST.

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