GHSA-5fqm-cc34-fcf5: Cosmos-Server's constellation public-devices endpoint accepts arbitrary bearer tokens

Summary GET /cosmos/api/constellation/public-devices discloses Constellation device metadata to a requester that supplies any non-empty Authorization header. The handler strips the string Bearer from the header but never validates the resulting token and never uses it in the database query. This was confirmed locally by routing a request through the real tokenMiddleware with Authorization: Bearer not-a-real-token. The request returned public Constellation device metadata from a disposable fixture. A missing-header negative control returned 401 Unauthorized, proving the bypass is specifically the acceptance of arbitrary bearer values. Details Source-to-sink path: - src/httpServer.go:690 registers /api/constellation/public-devices on the authenticated admin API router. - src/httpServer.go:815-817 applies SecureAPI(..., public=false, ...), which runs tokenMiddleware. - src/httpServer.go:231-237 only treats Authorization: Bearer cosmos_... as a Cosmos API token for validation. Other bearer strings are not validated by the middleware and fall through to the handler. - src/constellation/api_devices_public.go:42-47 checks only that the Authorization header is present. - src/constellation/api_devices_public.go:49-50 strips Bearer but does not verify the token or compare it with a device/API key. - src/constellation/api_devices_public.go:63-67 queries all non-blocked and non-invisible devices without including the stripped auth value in the filter. - src/constellation/api_devices_public.go:84-99 returns device names, user nicknames, cleaned VPN/internal IPs, role flags, public hostname, and port. The handler does not call utils.CheckPermissions, utils.CheckPermissionsOrSelf, the Cosmos API-token permission check, or any Constellation-token validation before returning the data. Default/common exposure evidence: - The route is registered in the standard server setup (src/httpServer.go:690). - Constellation is a documented product feature described as the VPN used to secu