Unrated severityNVD Advisory· Published Aug 1, 2026· Updated Aug 3, 2026
better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider
CVE-2026-67336
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <1.6.11
Patches
Vulnerability mechanics
References
2- github.com/better-auth/better-auth/security/advisories/GHSA-9h47-pqcx-hjr4mitrevendor-advisory
- www.vulncheck.com/advisories/better-auth-before-insecure-cryptographic-defaults-via-oidcprovidermitrethird-party-advisory
News mentions
0No linked articles in our index yet.