CVE-2026-75866: Missing Authorization

Punk::OAuth2::Server versions through 0.03 for Perl issue access tokens outside a client's registered scopes and grant types because no authorization path reads them. Punk::OAuth2::Server::Store registers scopes and granttypes per client and documents both as client registration. token dispatches...

CVE-2026-53518: Concurrent Execution using Shared Resource with Improper Synchronization

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorizationcode grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two...

Nextcloud: OAuth2 "authorization_code" is valid indefinetly

A security advisory reported that the OAuth2 endpoint was not following best practices, as the authorization code was generated without a timeout, allowing an attacker with access to obtain and redeem the code in the future...