PSIRT JWT used for authentication in web GUI signed with static key

{
  "id": "8415423749d72842e9006b63a47c6d9b342152b33066322c08b77dca0d21ddbe",
  "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-170",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "PSIRT JWT used for authentication in web GUI signed with static key",
    "summary": "A vulnerability in the FortiMonitorOnSight web portal may let a remote unauthenticated attacker bypass authentication using a forged or reused JWT.",
    "evidence": "may allow a remote unauthenticated attacker to bypass authentication via forged or reused JWT",
    "products": [
      {
        "name": {
          "value": "FortiMonitorOnSight",
          "evidence": "FortiMonitorOnSight 7.2"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.8 or above",
            "evidence": "Upgrade to 7.2.8 or above"
          }
        ],
        "affected_versions": [
          {
            "value": "7.2.4 through 7.2.7",
            "evidence": "7.2.4 through 7.2.7"
          },
          {
            "value": "7.2.0 through 7.2.2",
            "evidence": "7.2.0 through 7.2.2"
          }
        ]
      }
    ],
    "severity": "critical",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-84390",
        "evidence": "CVE ID CVE-2026-84390"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "Severity Critical"
  },
  "source_id": "official-fortinet-psirt",
  "document_id": 23567,
  "published_at": "2026-09-08T07:00:00+00:00"
}