CVE-2026-46538 – Microsoft UFO accepts cross-device TASK_END messages by session_id only, allowing peer task-result injection

CVE ID :CVE-2026-46538

Published : May 27, 2026, 11:16 p.m. | 1 hour, 15 minutes ago

Description :Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO’s constellation client tracks pending task responses by session_id only and does not verify that a TASK_END message came from the device that originally received the task. When the constellation sends a task to a target device, it records a pending Future under a session key. The pending task record stores the expected device ID, but the completion path ignores that binding. If another authenticated peer device sends a forged TASK_END with the same session_id, the constellation accepts the response and completes the victim device’s pending Future with attacker-controlled result data. This is an authenticated cross-device task-result injection issue.

Severity: 5.9 | MEDIUM

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