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CVE-2026-67332 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:6.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/better-auth/better-auth/security/advisories/GHSA-p2fr-6hmx-4528	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/better-auth-oauth-provider-before-beta-4-authorization-bypass	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-285	Improper Authorization	[email protected]

Affected Products

Product	Versions
better-auth/oauth-provider	>= 1.4.8, < 1.7.0-beta.4 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 1.7.0-beta.4moderate effort After upgrading, run the schema migration with the command: npx auth migrate. Workaround:low effort Set validAudiences to a single audience or leave it unset to default to your base URL. The provider will reject any other requested resource, preventing cross-audience selection. Workaround:low effort Configure each resource server to accept a token only when its own identifier is the expected audience, and to reject tokens whose aud is an array that also lists other audiences. Workaround:low effort Do not rely on the resource indicator as an authorization boundary until you run a release that contains the fix.

Product

Versions

better-auth/oauth-provider

>= 1.4.8, < 1.7.0-beta.4 (semver)

CPE

No CPEs found in CPE dictionary for this product.

Remediation

Upgrade: 1.7.0-beta.4moderate effort
After upgrading, run the schema migration with the command: npx auth migrate.
Workaround:low effort
Set validAudiences to a single audience or leave it unset to default to your base URL. The provider will reject any other requested resource, preventing cross-audience selection.
Workaround:low effort
Configure each resource server to accept a token only when its own identifier is the expected audience, and to reject tokens whose aud is an array that also lists other audiences.
Workaround:low effort
Do not rely on the resource indicator as an authorization boundary until you run a release that contains the fix.

Change History

2 change records found show changes

Date	Action	Recorded By
Aug 3, 2026	CVE Modified	CISA-ADP
Aug 1, 2026	New CVE Received	[email protected]