CVE-2026-48781 Postiz has cross-tenant SUPERADMIN takeover via Skool-provider JWT forgery

Postiz is an AI social media scheduling tool. In versions prior to 2.21.8, the Skool integration callback signed an attacker-controlled JSON blob into a session-shape JWT using the application's JWTSECRET, and the auth middleware trusted every claim in that JWT without re-resolving the user from...