GHSA-PJ6Q-4VQ4-R8CG Ech0 allows PUT /api/echo/like/:id unauthenticated: anonymous callers to modify any echo's fav_count

Summary PUT /api/echo/like/:id at internal/router/echo.go:12 is registered on PublicRouterGroup with no authentication and no rate limit. Anonymous callers increment the favcount counter on any echo including private echoes by UUID, repeat the request without deduplication, and trigger a database...