HIGH🇵🇱 Wersja polska

CVE-2026-53518

CVSS 7.6v4.0pub. 2026-07-15upd. 2026-07-21

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.

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

  • Better Auth

    APP
    Better-Auth
    1.6.0 – 1.6.11 (excl.)

  • Better Auth Better Auth\/oauth Provider

    APP
    Better-Auth
    1.6.0 – 1.6.11 (excl.)
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CHECK WITH VENDOR
No clear patch data available. Check vendor references.
CWE
References

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