{"id":"CVE-2026-55440","summary":"Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service","details":"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.","aliases":["GHSA-hxjv-fmjf-wmjf"],"modified":"2026-07-18T03:47:39.727440873Z","published":"2026-07-16T15:35:51.346Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-400","CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55440.json"},"references":[{"type":"WEB","url":"https://github.com/microsoft/UFO/releases/tag/3.0.7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55440.json"},{"type":"ADVISORY","url":"https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55440"},{"type":"FIX","url":"https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/microsoft/ufo","events":[{"introduced":"0"},{"fixed":"cc653bde75337ab60c320e6b7cb61b86ba6ca948"},{"fixed":"219b8f77eb47b4b7c10145fe49c1dc2f9438c287"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.0.7"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["3.0.6","v3.0.1","v3.0.4","v3.0.3","v3.0.2","v3.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55440.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}