FKIE_CVE-2026-72657

Vulnerability from fkie_nvd - Published: 2026-08-13 20:17 - Updated: 2026-09-04 20:17
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
Authorization Bypass Through User-Controlled Key (CWE-639) in Fleet Server can lead to information disclosure via Manipulating User-Controlled Variables (CAPEC-77). The authorization decision for artifact downloads relied on a client-supplied value that was persisted without being validated against the server-side record of the requesting agent's assignment. An authenticated party in possession of a valid enrolled agent credential could therefore retrieve a policy the agent is not assigned to.
References
security@elastic.cohttps://discuss.elastic.co/t/fleet-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-112/389509Vendor Advisory
Impacted products
Vendor Product Version
elastic fleet_server *
elastic fleet_server *
elastic fleet_server 9.5.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Fleet Server",
          "vendor": "Elastic",
          "versions": [
            {
              "lessThanOrEqual": "8.19.19",
              "status": "affected",
              "version": "8.3.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.4",
              "status": "affected",
              "version": "9.0.0",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "9.5.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@elastic.co"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:elastic:fleet_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "32BDB1E6-378D-4F9E-AA4F-01AF485D4E8E",
              "versionEndExcluding": "8.19.20",
              "versionStartIncluding": "8.3.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:elastic:fleet_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2F3D7A90-62AA-4F93-B8E9-7F5CBE294B84",
              "versionEndExcluding": "9.4.5",
              "versionStartIncluding": "9.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:elastic:fleet_server:9.5.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "B3B2002A-7C58-4BA8-AC16-3B02CF8F40F3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authorization Bypass Through User-Controlled Key (CWE-639) in Fleet Server can lead to information disclosure via Manipulating User-Controlled Variables (CAPEC-77). The authorization decision for artifact downloads relied on a client-supplied value that was persisted without being validated against the server-side record of the requesting agent\u0027s assignment. An authenticated party in possession of a valid enrolled agent credential could therefore retrieve a policy the agent is not assigned to."
    }
  ],
  "id": "CVE-2026-72657",
  "lastModified": "2026-09-04T20:17:55.047",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security@elastic.co",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72657",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-13T19:51:05.667444Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-13T20:17:25.870",
  "references": [
    {
      "source": "security@elastic.co",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://discuss.elastic.co/t/fleet-server-8-19-20-9-4-5-9-5-1-security-update-esa-2026-112/389509"
    }
  ],
  "sourceIdentifier": "security@elastic.co",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ],
      "source": "security@elastic.co",
      "type": "Secondary"
    }
  ]
}



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