CVE-2026-110008

The @fastify/oauth2 library (versions 7.2.0 through 8.3.1 ) is vulnerable to Login CSRF because state and code-verifier cookies are set without a Path attribute on routes with multiple segments. During the OAuth callback, the clearing step uses a root path, causing the original cookies to persist...

CVE-2026-110008 @fastify/oauth2 vulnerable to Login CSRF via OAuth state cookie not cleared after callback

@fastify/oauth2 is a Fastify wrapper for OAuth2 login flows. In versions 7.2.0 through 8.3.1, the state and code-verifier cookies are set without a Path attribute at a login route with two or more path segments, while the clearing step at the OAuth callback writes them with a root path, so the...

Cross-site Request Forgery (CSRF)

Overview @fastify/oauth2 is a Perform login using oauth2 protocol Affected versions of this package are vulnerable to Cross-site Request Forgery CSRF due to the OAuth state-check cookies in the index.js authorization flow. An attacker can log a victim into the attacker’s account by planting...

CVE-2026-18165 @fastify/oauth2 vulnerable to Login CSRF via plantable OAuth state cookies

@fastify/oauth2 is an OAuth 2.0 plugin for Fastify. In versions from 7.2.0 up to but not including 8.3.0, the plugin validates the OAuth state, and with PKCE the code verifier, by comparing the callback query parameter against an unprefixed, predictable cookie, with no server-side binding to the...