CVE-2026-67332
Received Received - Intake

OAuth Token Audience Bypass in Better Auth Provider

Publication date: 2026-08-01

Last updated on: 2026-08-01

Assigner: VulnCheck

Description
@better-auth/oauth-provider before 1.7.0-beta.4 fails to bind access-token audience to the authorization grant, allowing clients to request tokens for unrelated resources. Attackers can complete an OAuth flow and obtain access tokens whose audience targets resource servers the authorization never covered, bypassing intended authorization boundaries.

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Meta Information

Published
2026-08-01
Last Modified
2026-08-01
Generated
2026-08-01
AI Q&A
2026-08-01
EPSS Evaluated
N/A
NVD
CVE-2026-67332
EUVD
EUVD-2026-51836

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
better-auth oauth-provider to 1.7.0-beta.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-285 The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

The vulnerability in @better-auth/oauth-provider before version 1.7.0-beta.4 allows attackers to obtain access tokens for resource servers not covered by the original authorization grant. This happens because the access-token audience is not properly bound to the authorization grant during the OAuth flow.

Impact Analysis

Attackers could gain unauthorized access to resources by obtaining tokens for unrelated servers. This bypasses intended authorization boundaries, potentially leading to data breaches or unauthorized actions on behalf of legitimate users.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating principles of least privilege and data protection. It may result in non-compliance with GDPR (data protection), HIPAA (health data security), or other regulations requiring strict access controls and auditability.

Mitigation Strategies

Upgrade @better-auth/oauth-provider to version 1.7.0-beta.4 or later to address the audience binding issue in OAuth flows.

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