What’s Vulnerable › Vulnerabilities

CVE-2026-46416: Microsoft UFO shared WebSocket handler state causes cross-client response hijacking

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-284

Description

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.

Affected products

• microsoft UFO: 3.0.1-4-ge2626659

References

• https://github.com/microsoft/UFO/security/advisories/GHSA-cwwh-p9rv-4pj4
• https://github.com/microsoft/UFO/security/advisories/GHSA-cwwh-p9rv-4pj4

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