{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.0.7"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "cc653bde75337ab60c320e6b7cb61b86ba6ca948"
            },
            {
              "fixed": "219b8f77eb47b4b7c10145fe49c1dc2f9438c287"
            }
          ],
          "repo": "https://github.com/microsoft/ufo",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-hxjv-fmjf-wmjf"
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-55440",
  "modified": "2026-07-18T03:42:07.139737168Z",
  "published": "2026-07-16T15:35:51.346Z",
  "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"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service"
}