Critical 9.1Published Oct 22, 2026

CVE-2026-114607better-auth: OAuth state can be used as a Magic Link to sign in as another user

Updated under an hour ago (Oct 28, 2026, 8:23 PM ET)

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It affects better-auth. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.42%, higher than 36% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.42% (percentile 36)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

better-auth better-auth better_auth:better_auth (from the name)	from 1.4.0-beta.18, < 1.7.7	CNA record

References

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-965c-763c-88jm	x-refsource-confirm
https://github.com/better-auth/better-auth/pull/11494	x-refsource-misc
https://github.com/better-auth/better-auth/commit/ac54bfd67821a7607533af2059858b12bc54e26a	x-refsource-misc
https://github.com/better-auth/better-auth/releases/tag/v1.7.7	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.