better-auth
: OAuth state can be used as a Magic Link to sign in as another user
Not on CISA's list of exploited flaws, and not in the news we track.
CVE-2026-114607Critical9.1
Black Shard's team can check your exposure to CVE-2026-114607 and take the fix off your plate.
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.
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Chance of exploitation in the next 30 days
0.42%
EPSS score from FIRST
Updated 13 Nov 2026, 12:01 UTC, 31 of 36 sources answering.
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