{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55440","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-16T21:59:57.017Z","datePublished":"2026-07-16T15:35:51.346Z","dateUpdated":"2026-07-16T16:23:56.463Z"},"containers":{"cna":{"title":"Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf"},{"name":"https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948","tags":["x_refsource_MISC"],"url":"https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948"},{"name":"https://github.com/microsoft/UFO/releases/tag/3.0.7","tags":["x_refsource_MISC"],"url":"https://github.com/microsoft/UFO/releases/tag/3.0.7"}],"affected":[{"vendor":"microsoft","product":"UFO","versions":[{"version":"< 3.0.7","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-16T15:35:51.346Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-hxjv-fmjf-wmjf","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-16T16:23:07.186935Z","id":"CVE-2026-55440","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-16T16:23:56.463Z"}}]}}