{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "MISP",
          "programFiles": [
            "app/Controller/CryptographicKeysController.php"
          ],
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "versions": [
            {
              "lessThanOrEqual": "2.5.45",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Scottish Government - National Cyber Team"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "iglocska"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Claude Opus 5 (1M context)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAffected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through \u003ccode\u003eCryptographicKeysController::view()\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eThe vulnerable handler queried \u003ccode\u003eCryptographicKey\u003c/code\u003e directly using the supplied key ID and selected sensitive fields such as:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ccode\u003etype\u003c/code\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003ccode\u003ekey_data\u003c/code\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003ccode\u003efingerprint\u003c/code\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003ebut did not fetch or authorize the associated parent event first.\u003c/p\u003e\n\u003cp\u003eThe upstream commit explicitly states that \u003ccode\u003ecryptographicKeys/view\u003c/code\u003e could return a \u003cstrong\u003eprotected event\u2019s signing key to any authenticated user\u003c/strong\u003e.\u003c/p\u003e\n\u003cp\u003eThe fix adds \u003ccode\u003eparent_id\u003c/code\u003e and \u003ccode\u003eparent_type\u003c/code\u003e to the lookup and then enforces authorization through the associated event using \u003ccode\u003efetchSimpleEvent($user, parent_id)\u003c/code\u003e. If the parent is not an Event, access is limited to site administrators.\u003c/p\u003eVersion affected: \u22642.5.45\u003cbr\u003e"
            }
          ],
          "value": "Affected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through CryptographicKeysController::view().\n\n\nThe vulnerable handler queried CryptographicKey directly using the supplied key ID and selected sensitive fields such as:\n\n\n\n  *  \ntype\n\n\n  *  \nkey_data\n\n\n  *  \nfingerprint\n\n\n\n\n\nbut did not fetch or authorize the associated parent event first.\n\n\nThe upstream commit explicitly states that cryptographicKeys/view could return a protected event\u2019s signing key to any authenticated user.\n\n\nThe fix adds parent_id and parent_type to the lookup and then enforces authorization through the associated event using fetchSimpleEvent($user, parent_id). If the parent is not an Event, access is limited to site administrators.\n\nVersion affected: \u22642.5.45"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-1",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862 Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639 Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "orgId": "00000000-0000-4000-9000-000000000000"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/MISP/MISP/commit/2edde619b"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected Events",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "00000000-0000-4000-9000-000000000000",
    "cveId": "CVE-2026-86408",
    "datePublished": "2026-09-07T12:11:00.737706Z",
    "dateReserved": "2026-09-07T12:11:12.888Z",
    "dateUpdated": "2026-09-07T12:11:12.965404Z",
    "requesterUserId": "00000000-0000-4000-9000-000000000000",
    "serial": 1,
    "state": "PUBLISHED",
    "vulnId": "gcve-1-2026-20228"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}