What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-26
• Weakness: CWE-294

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

• microsoft UFO: 3.0.1-4-ge2626659

References

• https://github.com/microsoft/UFO/security/advisories/GHSA-wmq2-74rj-7pjc
• https://github.com/microsoft/UFO/security/advisories/GHSA-wmq2-74rj-7pjc

Get alerted when CVE-2026-46538 or the next vulnerability affects your stack