What’s Vulnerable › Vulnerabilities

CVE-2026-46544: Microsoft UFO reuses client-supplied WebSocket session IDs and replays stale task results to new authenticated requesters

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% 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-639

Description

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: 3.0.1-4-ge2626659

References

• https://github.com/microsoft/UFO/security/advisories/GHSA-29gc-vqjp-7fqf
• https://github.com/microsoft/UFO/security/advisories/GHSA-29gc-vqjp-7fqf

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