EEF-CVE-2026-21621 Improper Scope Enforcement in OAuth client_credentials Flow Allows Read-Only API Key to Escalate to Full Access

Summary Incorrect Authorization vulnerability in hexpm hexpm/hexpm 'Elixir.HexpmWeb.API.OAuthController' module allows Privilege Escalation. An API key created with read-only permissions domain: "api", resource: "read" can be escalated to full write access under specific conditions. When exchangi...