CVE WatchJul 15, 2026

CVE-2026-53518

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oa

CVSS

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No CVSS

EPSS

0.5%

p39

KEV

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Exploit Today

0-100

Published: Jul 15, 2026 · Last modified: Jul 15, 2026 · CWE-362 · CWE-367

EPSS · 30d

Not enough EPSS history yet.

Technical description

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.

Official references

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