# Attachment ownership follow-through

2 November 2026. Source review plus bounded existing relational fixtures; not complete Phase 05, integrated security testing or deployed acceptance.

AttachmentsController.FindOwnedAttachmentAsync:42–47 includes JobApplication while selecting the raw child ID. JobTrackerContext:169–170 denies missing owners and filters JobApplication by CurrentUserId; the Attachment relation at 264–268 uses the parent foreign key. Attachment itself does not have a separate owner filter. Download, Rename and Delete all call this helper. ListForJob first checks the owned JobApplication exists, then limits child rows to that ID. Maintain these relationships; raw child queries without equivalent parent checks are not automatically safe.

AttachmentsControllerTests contains attribute/extension/size reflection tests, not cross-tenant behavioral proof. OwnershipGuardTests similarly checks helper presence. The stronger existing AttachmentConsistencyTests.Another_users_attachment_cannot_be_downloaded_renamed_or_deleted seeds a foreign job/file, clears tracking, checks three NotFound results and verifies the row/file remain.

Fresh targeted execution on the Phase 10 working tree: all 14 AttachmentConsistencyTests passed, zero failures/skips, exit 0, temporary SQLite and synthetic files only. Before execution, git diff between security and Phase 10 branches showed no JobTrackerApi/JobTrackerApi.Tests source difference. Existing Release assembly used --no-build/--no-restore. Evidence published and independently verified on Phase 10 at `db818e5ebd19eeedc05ae58dc3f7a908ce0e713d`, docs/redesign/phase-10/p10-04-evidence/attachment-ownership-and-storage.trx.gz. Uncompressed SHA256 `b589ad1139cb200d9de64b863d65e3304cea0230eda55d89476e5f79347fe84a`.

Result: selected local controller/storage behavior PASSED. Not an authenticated HTTP attack, complete negative list/upload/missing-owner matrix, MariaDB retest, production probe or final scan. Keep those gaps open. No new vulnerability or production exception is asserted; no backend fix was needed for these reviewed paths. Final integrated scan/testing stays deferred until relevant application changes are complete.