CVE-2026-71415 Kirby: File upload permissions are not checked during processing of chunk data

Kirby is an open-source content management system. From 5.0.0 until 5.5.2, Kirby's REST API chunk upload handler in src/Api/Upload.php did not run the relevant upload authorization preflight in Kirby\Api\Upload::process before Kirby\Api\Upload::processChunk persisted chunk data. An authenticated...