CVE-2026-46544: Microsoft Ufo

Medium severity, CVSS 5.3. EPSS: 0.7% chance of exploitation in the next 30 days.

Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO accepts client-supplied session_id values in WebSocket task messages and reuses an existing in-memory session object if that session_id already exists. If a prior session has completed and remains in memory with populated results, a different authenticated client can send a new TASK message using the same session_id. The server re-enters the existing session object and sends the stale stored result to the new requester through the normal send_task_end() callback path. This is an authenticated cross-client stale result replay issue. The issue requires that the attacker knows or can predict a live or recently completed session_id.

Affected products

• Microsoft Ufo: version 3.0.1-4-ge2626659 only

Published 2026-05-27. Last modified 2026-06-17.