Cross-Site Request Forgery Vulnerability in Authlib Python Library

CVE-2025-68158

What is CVE-2025-68158?

The Authlib library, which facilitates the development of OAuth and OpenID Connect servers, has a vulnerability that permits Cross-Site Request Forgery (CSRF) attacks in versions 1.6.5 and earlier. This occurs because the library's cache-backed state/request-token storage does not associate state management with the user session that initiated the request. As a result, attackers who can obtain a valid state—potentially through repeating an authentication flow—can execute unauthorized actions. This issue has been resolved in version 1.6.6, where proper session ties have been implemented.

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References