Missed certificate verification in AD Connector communication with FortiClient EMS

{
  "id": "0a6e382f1c90a9341ed43af2944167d3eb686a35acfaa4e657f3baa8a26a749c",
  "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-147",
  "method": "llm",
  "payload": {
    "kind": "patch",
    "title": "Missed certificate verification in AD Connector communication with FortiClient EMS",
    "summary": "A certificate validation vulnerability in FortiClient EMS may let a remote unauthenticated attacker impersonate an AD Connector using a valid API key. Upgrade affected releases to 7.4.6 or above, or migrate from 7.2 to a fixed release.",
    "evidence": "An Improper Certificate Validation vulnerability [CWE-295] in FortiClient EMS may allow a remote unauthenticated attacker to impersonate an AD Connector via a valid API Key.",
    "products": [
      {
        "name": {
          "value": "FortiClientEMS",
          "evidence": "FortiClientEMS 7.4"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.4.6 or above",
            "evidence": "Upgrade to 7.4.6 or above"
          }
        ],
        "affected_versions": [
          {
            "value": "7.4.3 through 7.4.5",
            "evidence": "7.4.3 through 7.4.5"
          },
          {
            "value": "7.4.0 through 7.4.1",
            "evidence": "7.4.0 through 7.4.1"
          }
        ]
      },
      {
        "name": {
          "value": "FortiClientEMS",
          "evidence": "FortiClientEMS 7.2"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "a fixed release",
            "evidence": "Migrate to a fixed release"
          }
        ],
        "affected_versions": [
          {
            "value": "7.2 all versions",
            "evidence": "7.2 all versions"
          }
        ]
      },
      {
        "name": {
          "value": "FortiClientEMS",
          "evidence": "FortiClientEMS 8.0"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-59836",
        "evidence": "CVE ID CVE-2026-59836"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "Severity Medium"
  },
  "source_id": "official-fortinet-psirt",
  "document_id": 23585,
  "published_at": "2026-07-14T07:00:00+00:00"
}