What is CVE-2026-46538?

CVE-2026-46538 is a medium-severity vulnerability in Microsoft Ufo, classified under Authentication Bypass by Capture-replay. CVSS score: 5.9/10. Published 2026-05-27.

How severe is CVE-2026-46538?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Microsoft Ufo

CVE-2026-46538

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 me…

EPSS: 0.000 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L.

Affected products

Microsoft Ufo — versions 3.0.1-4-ge2626659

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay
CWE-345 — Insufficient Verification of Data Authenticity

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-46538?: CVE-2026-46538 is a medium-severity vulnerability in Microsoft Ufo, classified under Authentication Bypass by Capture-replay. CVSS score: 5.9/10. Published 2026-05-27.
How severe is CVE-2026-46538?: Medium severity. CVSS v3 base score is 5.9 out of 10.