CVE-2026-67332: Improper Authorization in better-auth oauth-provider
A vulnerability in better-auth oauth-provider before version 1.7.0-beta.4 allows improper authorization by failing to bind the access-token audience to the authorization grant. This flaw enables clients to request tokens for resource servers not covered by the original authorization, potentially bypassing intended access controls. The issue affects version 1.4.8 specifically and has a medium severity rating with a CVSS score of 5.3.
AI Analysis
Technical Summary
CVE-2026-67332 is an authorization bypass vulnerability in better-auth oauth-provider versions before 1.7.0-beta.4. The component does not correctly bind the access-token audience to the authorization grant, allowing attackers who complete an OAuth flow to obtain access tokens targeting resource servers outside the scope of the original authorization. This results in tokens that can be used to access unauthorized resources, violating intended authorization boundaries. The vulnerability is confirmed in version 1.4.8. No official patch or remediation level has been published yet.
Potential Impact
Attackers can obtain access tokens with audiences for resource servers not authorized by the original grant, potentially allowing unauthorized access to protected resources. This breaks the intended authorization model of the OAuth provider, leading to privilege escalation within affected deployments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict OAuth client permissions and monitor for unusual token requests. Avoid using affected versions in production environments if possible.
CVE-2026-67332: Improper Authorization in better-auth oauth-provider
Description
A vulnerability in better-auth oauth-provider before version 1.7.0-beta.4 allows improper authorization by failing to bind the access-token audience to the authorization grant. This flaw enables clients to request tokens for resource servers not covered by the original authorization, potentially bypassing intended access controls. The issue affects version 1.4.8 specifically and has a medium severity rating with a CVSS score of 5.3.
CVSS v4.0
Score 5.3medium
Affected software
pkg:npm/@better-auth/oauth-providerRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-67332 is an authorization bypass vulnerability in better-auth oauth-provider versions before 1.7.0-beta.4. The component does not correctly bind the access-token audience to the authorization grant, allowing attackers who complete an OAuth flow to obtain access tokens targeting resource servers outside the scope of the original authorization. This results in tokens that can be used to access unauthorized resources, violating intended authorization boundaries. The vulnerability is confirmed in version 1.4.8. No official patch or remediation level has been published yet.
Potential Impact
Attackers can obtain access tokens with audiences for resource servers not authorized by the original grant, potentially allowing unauthorized access to protected resources. This breaks the intended authorization model of the OAuth provider, leading to privilege escalation within affected deployments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict OAuth client permissions and monitor for unusual token requests. Avoid using affected versions in production environments if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-07-29T13:07:47.015Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6deb27bf32cb7a34c1fc42
Added to database: 08/01/2026, 12:48:39 UTC
Last enriched: 08/01/2026, 13:03:55 UTC
Last updated: 08/01/2026, 13:51:32 UTC
Views: 5
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