{"id":"CVE-2026-55440","aliases":["EUVD-2026-44947","GHSA-hxjv-fmjf-wmjf"],"status":"published","title":"Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service","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.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00721,"percentile":0.54274,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400","CWE-862"],"published":"2026-07-16T15:35:51Z","modified":"2026-10-28T02:30:56Z","products":[{"vendor":"microsoft","product":"ufo"}],"references":[{"url":"https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf","tags":["x_refsource_CONFIRM","exploit","advisory"]},{"url":"https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/microsoft/UFO/releases/tag/3.0.7","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55440.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55440","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-55440","title":"Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service","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.","status":"published","published":"2026-07-16T15:35:51.346Z","modified":"2026-07-16T16:23:56.463Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-400","CWE-862"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-44947","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.","status":"published","published":"2026-07-16T15:35:51Z","modified":"2026-07-16T16:23:56Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T18:19:51.364603Z"}],"nvd":[{"id":"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.","status":"published","published":"2026-07-16T16:19:13.787Z","modified":"2026-10-24T20:10:00.137Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-400","CWE-862"],"updated_at":"2026-11-02T14:12:30.250437Z"}],"osv":[{"id":"CVE-2026-55440","title":"Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service","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.","status":"published","published":"2026-07-16T15:35:51.346Z","modified":"2026-10-28T02:30:56.582319429Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400","CWE-862"],"updated_at":"2026-11-02T15:45:11.22012Z"}]}}