submit and draft-sync took document ids straight from the request body with no
ownership check: a caller who knew a foreign document's id could attach another
citizen's upload to their own aanvraag (surfacing on the behandelaar's beoordeling
screen, POSTed to OpenZaak as their zaakinformatieobject) and permanently block the
victim's own delete by flipping Linked=true. ADR-0001 holds the FE has no authority;
this trusted it anyway.
Adds DocumentStore.ForeignIds(ids, owner) and calls it from both write paths before
any write, 400 ProblemDetails on a mismatch.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ehoandClaude Opus 5
a394950a1d