CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards

Mattermost versions 10.4.x = 10.4.1, 9.11.x = 9.11.7, 10.3.x = 10.3.2, 10.2.x = 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards...