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    CVE-2026-110862

    Better Auth from 1.4.0-beta.18 before 1.7.7 contains an authentication bypass vulnerability that allows unauthenticated attackers to sign in as other users by reusing OAuth state values as Magic Link tokens. Attackers can start an OAuth sign-in with a victim's email and submit the returned state to Magic Link verification, gaining sessions or creating falsely email-verified accounts.

    Published:Oct 14, 2026
    Last Modified:Oct 15, 2026
    EPS:Oct 14, 2026
    EPSS Score:0.00321
    CVSS Score:9.1

    Affected Products

    Vendor
    Better-auth
    Product
    Better Auth

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-121802 (CVSS 9.1) — @better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any…
    CVE-2026-114607 (CVSS 9.1) — Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, dep…
    CVE-2026-110864 (CVSS 9.1) — Better Auth from 1.5.0-beta.12 before 1.7.7 contains an authentication bypass vulnerability in the OAuth Proxy…
    CVE-2026-110861 (CVSS 6.3) — Better Auth @better-auth/drizzle-adapter and better-auth from 1.6.17 before 1.7.7, and @better-auth/kysely-ada…
    CVE-2026-109346 (CVSS 8.5) — better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAut…
    CVE-2025-71401 (CVSS 9.3) — better-auth (npm) before 1.4.2 allows an external request to configure baseURL when it is not otherwise define…
    CVE-2025-71399 (CVSS 8.8) — Better Auth relies on better-call, which uses the rou3 router library. In affected versions of rou3, paths are…
    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…

    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