Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53514
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 18:16:47 UTC
Updated2026-07-21 13:41:03 UTC
DescriptionBetter 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

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

EPSS: 0.002020000 probability, percentile 0.103460000 (date 2026-07-20)

Problem Types: CWE-287 | CWE-345 | CWE-441 | CWE-862 | CWE-287 CWE-287: Improper Authentication | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Better-auth Better Auth All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Better-auth Better-auth affected < 1.6.11 Not specified

References

ReferenceSourceLinkTags
github.com/better-auth/better-auth/commit/23094a628f007f801be6d26e5b15dc... [email protected] github.com Patch
github.com/better-auth/better-auth/pull/9577 [email protected] github.com Issue Tracking, Patch
github.com/better-auth/better-auth/releases/tag/v1.6.11 [email protected] github.com Release Notes
github.com/better-auth/better-auth/security/advisories/GHSA-fmh4-wcc4-5jm3 [email protected] github.com Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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