CVE-2026-109564 LearnHouse before 1.4.0 Missing Authorization via Playground Duplicate Endpoint

LearnHouse before 1.4.0 contains a missing authorization vulnerability in POST /api/v1/playgrounds/uuid/duplicate that skips the read-access and draft checks enforced by getplayground. Authenticated users with playground creation rights, such as Instructors, who know a RESTRICTED or unpublished...