CVE-2026-67336 — better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider
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…
Published: 2026-08-01 · CVSS: 9.4 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7