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CVE-2026-55440

6.5 · MEDIUM

Microsoft UFO open-source framework for intelligent automation across devices and platforms.

Published Jul 16, 2026CWE-400EPSS 1.26%

Overview

CVE-2026-55440 is a medium-severity vulnerability. It was published on July 16, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948GitHubgithub.com/microsoft/UFO/releases/tag/3.0.7GitHubgithub.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjfGitHubgithub.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55440?

CVE-2026-55440 is a medium-severity vulnerability. It was published on July 16, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-55440?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55440?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55440?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55440 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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