CVE-2026-55440 | Microsoft UFO open-source framework for intelligent automati… | CVSS 6.5 MEDIUM

Description

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 without owner_client_id, allowing an authenticated client to create an unowned attacker-chosen session_id such as constellation_task_id = f"{task_name}@{task_id}" and deny the legitimate owner or exhaust memory with phantom sessions. This issue is fixed in version 3.0.7.

Metadata

CVE ID: CVE-2026-55440
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 21:59 UTC
Published: 2026-07-16 15:35 UTC
Last updated: 2026-07-16 16:23 UTC
Primary CWE: CWE-400
CWE-400: Uncontrolled Resource Consumption
Vendor / Product: microsoft / UFO
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
microsoft	UFO	—	< 3.0.7

Weakness (CWE)

CWE	Source	Description
CWE-400	cna	CWE-400: Uncontrolled Resource Consumption
CWE-862	cna	CWE-862: Missing Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References (3)

https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf
https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948 https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948
https://github.com/microsoft/UFO/releases/tag/3.0.7 https://github.com/microsoft/UFO/releases/tag/3.0.7