Unrated severityNVD Advisory· Published Jul 16, 2026· Updated Jul 16, 2026
Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service
CVE-2026-55440
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.
Affected products
1Patches
Vulnerability mechanics
References
3- github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948mitrex_refsource_MISC
- github.com/microsoft/UFO/releases/tag/3.0.7mitrex_refsource_MISC
- github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjfmitrex_refsource_CONFIRM
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