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CVE-2026-114607

better-auth: OAuth state can be used as a Magic Link to sign in as another user PUBLISHED

Description (CNA)

Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, deployments that enable Magic Link with storeToken set to plain, or with storeToken set to hashed and the global verification.storeIdentifier setting also set to hashed, enable a built-in social or Generic OAuth provider, and use account.storeStateStrategy set to database can accept an OAuth sign-in state value as a Magic Link token. These settings can cause Magic Link verification records and OAuth state to resolve to the same stored identifier, allowing an unauthenticated attacker to start OAuth sign-in for a known email address and redeem the returned state through Magic Link without controlling the mailbox or completing the provider callback. The attacker can obtain a normal session for an existing user, or create an account incorrectly marked as email verified when sign-up is enabled. This issue is fixed in version 1.7.7.

Affected (CNA)

Vendor / productVersions
better-auth / better-authaffected >= 1.4.0-beta.18, < 1.7.7

CWE

CWE-287

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.