PYSEC-2026-2664 motionEye has an Arbitrary File Read via Path Traversal in Picture/Movie Preview Endpoint

Summary motionEye v0.43.1 latest stable is vulnerable to path traversal in the picture and movie API endpoints, like /picture/id/preview/filename. Neither the API handlers, nor the mediafiles.py functions like getmediapreview check for .. sequences in the filename parameter, except getmediaconten...