GHSA-95cv-r8x4-vh75: OpenList: Authenticated users can rename files outside their base path via batch rename `src_name` traversal

The /api/fs/batch_rename handler validates and authorizes only the requested source directory. It rejects path separators in new_name, but it does not validate src_name. The handler concatenates src_dir and attacker-controlled src_name, then passes the result to the filesystem rename layer, where the path is normalized.

An authenticated user with rename permission can set src_name to traversal segments such as ../../ab/secret.txt. When the user’s base path is /team/a and src_dir is /writable, the authorized directory becomes /team/a/writable, but the final source path normalizes to /team/ab/secret.txt. The file outside the user’s base path is then renamed.