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CVE-2026-48781 is a critical authentication/authorization flaw in Postiz, an AI social media scheduling tool, affecting versions prior to 2.21.8. In the Skool integration callback, attacker-controlled JSON was signed into a session-shaped JWT using the application's JWT_SECRET. Postiz's authentication middleware then trusted the claims in that JWT without re-resolving the user from the database or otherwise independently validating the asserted identity and privilege level. As a result, an authenticated attacker could forge a JWT containing arbitrary claims, including elevated role and tenant context, and obtain a forged SUPERADMIN session. The flaw enables cross-tenant impersonation of arbitrary organizations and effectively breaks trust boundaries between tenants on the same Postiz instance.
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