Vulnerability in Microsoft Ufo
CVE-2026-46416
Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO creates one shared UFOWebSocketHandler instance and reuses it for multiple authenticated WebSocket connections. The handler stores per-connection protocol objects in mutable instance fields. Each new WebSocket connection overwrites those fields. Later, message handlers send responses through the shared fields instead of through protocol objects bound to the originating connection. As a result, the most recently connected authenticated client can receive protocol responses that belong to another authenticated client.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Microsoft Ufo — versions 3.0.1-4-ge2626659
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-46416?
- CVE-2026-46416 is a medium-severity vulnerability in Microsoft Ufo, classified under Improper Access Control. CVSS score: 6.3/10. Published 2026-05-27.
- How severe is CVE-2026-46416?
- Medium severity. CVSS v3 base score is 6.3 out of 10.