What is CVE-2026-55440?

CVE-2026-55440 is a medium-severity vulnerability in Microsoft Ufo, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-16.

How severe is CVE-2026-55440?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Microsoft Ufo

CVE-2026-55440

Microsoft UFO open-source framework for intelligent automation across devices and platforms. Prior to 3.0.7, the COMMAND_RESULTS handler in ufo/server/ws/handler.py called get_or_create_session in ufo/server/services/session_manager.py wit…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Microsoft Ufo — versions < 3.0.7

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption
CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-55440?: CVE-2026-55440 is a medium-severity vulnerability in Microsoft Ufo, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-16.
How severe is CVE-2026-55440?: Medium severity. CVSS v3 base score is 6.5 out of 10.