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CVE-2026-53514— Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin

CVSS 7.7 · High EPSS 0.02% · P4

Possible ATT&CK Techniques 1AI

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I. Basic Information for CVE-2026-53514

Vulnerability Information
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Vulnerability Title
Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin
Source: NVD (National Vulnerability Database)
Vulnerability Description
Better 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 obtained outside the invited mailbox and requireEmailVerificationOnInvitation: true is not enabled, the organization plugin's acceptInvitation, rejectInvitation, getInvitation, and listUserInvitations recipient endpoints use session.user.email and an invitation ID without sufficient verified-email ownership proof, allowing a user with an unverified session for the invited email address to accept an organization invitation after obtaining the invitation ID. This issue is fixed for the original default behavior in version 1.6.11, while 1.6.14 restored compatibility for built-in opaque invitation IDs and leaves affected configurations requiring secure options.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
better-authbetter-auth < 1.6.11 -

II. Public POCs for CVE-2026-53514

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6533 chars
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III. Intelligence Information for CVE-2026-53514

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Patches & Fixes for CVE-2026-53514 (2)

Vendor Advisories for CVE-2026-53514 (1)

Vendor Pages for CVE-2026-53514 (1)

Same Patch Batch · better-auth · 2026-07-15 · 8 CVEs total

CVE-2026-535139.6 CRITICALBetter Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/ss
CVE-2026-535168.3 HIGHBetter Auth: Account takeover via OAuth auto-link to unverified pre-registered email
CVE-2026-535178.1 HIGHBetter Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay
CVE-2026-453377.6 HIGHBetter Auth: Device authorization approve and deny accept any authenticated session while
CVE-2026-535157.1 HIGHBetter Auth: Privilege escalation via SSO provider registration: missing admin role check
CVE-2026-53518Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Us
CVE-2026-53512Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-287

V. Comments for CVE-2026-53514

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