Vulnerability · Published May 27, 2026 · Assigned by GitHub_M
CVE-2026-46538Microsoft UFO accepts cross-device TASK_END messages by session_id only, allowing peer task-result injection
Medium 5.9
In plain English
A medium-severity insufficient verification of data authenticity in UFO from microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-294, CWE-345 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
References
- https://github.com/microsoft/UFO/security/advisories/GHSA-wmq2-74rj-7pjc x_refsource_CONFIRM