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 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.

Score

CVSS 3.1 6.5 Medium

Status

Deferred - security-advisories@github.com

Published

2026-07-16

Last modified

2026-10-24

Weaknesses

CWE-400, CWE-862

Affected products

• Ufo (Microsoft)

References

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