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Vulnerability record · CVE-2026-53516 · published 15 July 2026

CVE-2026-53516: Better-auth better auth improper authentication vulnerability

Better Auth · Better Auth

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.

8.3 CVSS 3.1 High EPSS 0.29% · top 80.7% CWE-287 · Improper authenticationCWE-345 · Insufficient verification of data authenticity
8.3CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
21 Jul 2026Last modified by NVD

Description

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/better-auth/better-auth/commit/da7e50beee849c59a2ed1ec6b3a38cc6ab9fb563 Patch
https://github.com/better-auth/better-auth/pull/9578 Issue TrackingPatch
https://github.com/better-auth/better-auth/releases/tag/v1.6.11 Release Notes
https://github.com/better-auth/better-auth/security/advisories/GHSA-g38m-r43w-p2q7 MitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.6CVE-2026-53513Better-auth\/sso improper input validation vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST…EPSS 0.25%9.1CVE-2026-53512Better-auth better auth improper authentication vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth toke…EPSS 0.27%8.1CVE-2026-53517Better-auth\/oauth-provider race condition vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oaut…EPSS 0.42%7.9CVE-2024-56734Better-auth better auth open redirect vulnerabilityBetter Auth is an authentication library for TypeScript. An open redirect vulnerability has been identified in the verify email endpoint of all versi…EPSS 0.40%7.7CVE-2026-53514Better-auth better auth improper authentication vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, and in 1.6.14 and later when invitation IDs can be obtain…EPSS 0.20%7.6CVE-2026-53518Better-auth\/oauth-provider race condition vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/toke…EPSS 0.41%7.6CVE-2026-45337Better-auth better auth improper authorization vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authent…EPSS 0.21%7.1CVE-2026-53515Better-auth\/sso improper privilege management vulnerabilityBetter Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register…EPSS 0.43%

Source: NIST National Vulnerability Database (record CVE-2026-53516), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.