CVE-2026-45543 Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible through a lingering Files share

Nextcloud is an open source content collaboration platform. From version 4.3.0 to before version 5.2.7, a removed collaborator retains unauthorized read access to uploaded respondent files for the affected form. The scope is limited to uploaded files for forms where that user previously had resul...