CVE-2026-78587 [LOW] – Incorrect Authorization (CWE-863) in Fleet Server can lead to a denial of service of agent

Incorrect Authorization (CWE-863) in Fleet Server can lead to a denial of service of agent upload operations via Privilege Abuse (CAPEC-122). Fleet Server does not correctly verify session ownership during multi-part data upload operations, allowing any authenticated agent to interfere with the active upload sessions belonging to other enrolled agents.