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    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 /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.

    Published:Jul 15, 2026
    Last Modified:Jul 15, 2026
    EPS:Jul 15, 2026
    EPSS Score:
    CVSS Score:7.6

    Affected Products

    Vendor
    Better-auth
    Product
    Better Auth

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-67333 (CVSS 5.1) — better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the sche…
    CVE-2026-67329 (CVSS 7.1) — @better-auth/stripe versions >= 1.4.11 and < 1.6.21, and >= 1.7.0-beta.0 and < 1.7.0-beta.10, contain an autho…
    CVE-2026-67334 (CVSS 5.1) — better-auth versions before 1.6.11 fail to delete cached sessions when removing users via admin, anonymous, or…
    CVE-2025-71403 (CVSS 7.1) — better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting…
    CVE-2026-67337 (CVSS 7.1) — better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookie…
    CVE-2025-71404 (CVSS 5.1) — better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerabili…
    CVE-2026-67327 (CVSS 8.7) — better-auth versions >= 1.1.3 and < 1.6.22 (and pre-release versions >= 1.7.0-beta.0 and < 1.7.0-beta.10) are …
    CVE-2026-67331 (CVSS 8.7) — better-auth SCIM versions from 1.5.0 before 1.7.0-beta.4 fail to bind non-organization SCIM providers to their…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High