CVE-2026-53517
8.1 · HIGHOverview
CVE-2026-53517 is a high-severity vulnerability affecting better-auth better-auth\/oauth-provider. It was published on July 15, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11.
Remediation
Check the references section for vendor advisories and patches from better-auth. Update better-auth\/oauth-provider to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| better-auth | better-auth\/oauth-provider | >= 1.6.0, < 1.6.11 | Affected |
| better-auth | better_auth | >= 1.4.9, < 1.6.11 | Affected |
Frequently Asked Questions
What is CVE-2026-53517?
CVE-2026-53517 is a high-severity vulnerability affecting better-auth better-auth\/oauth-provider. It was published on July 15, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-53517?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-53517?
Check the references section for vendor advisories and patches from better-auth. Update better-auth\/oauth-provider to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-53517?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-53517 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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