The delete action computed $is_ok_path to confirm the requested path sits
below a configured Storage area, but never consulted it, so the check was
dead code and unlink() ran on whatever path was supplied. The path comes
from detaintPathAllowAbsolute($_REQUEST['path']), which deliberately
permits absolute paths, so nothing else constrained the target.
Return with an error when the path is not below a Storage area. Deleting
already requires System Edit, so this is not reachable by a low privilege
user, but the containment check should do what it was written to do.
The adjacent $path_parts assignment is also unused; left in place as it
predates this change.
Refs GHSA-g355-3rf6-f38v.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
