MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected Events

{
  "id": "27872f324d5d18988c6f316dc3617f8eff5e6a9af3d62852ec2f3d5374d09ec1",
  "url": "https://osv.dev/vulnerability/CVE-2026-86408",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected Events",
    "summary": "Affected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through CryptographicKeysController::view(). The vulnerable handler queried CryptographicKey directly using the supplied key ID and selected sensitive fields such as: * type * key_data * fingerprint but did not fetch or authorize the associated parent event first. The upstream commit explicitly states that cryptographicKeys/view could return a protected event’s signing key to any authenticated user. The 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. Version affected: ≤2.5.45",
    "evidence": "osv:CVE-2026-86408",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-86408",
      "aliases": [
        "CVE-2026-86408"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/misp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2edde619b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.5.45"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2edde619b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86408.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:47.097324152Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86408.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-86408",
        "https://github.com/MISP/MISP/commit/2edde619b",
        "https://github.com/MISP/MISP"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639",
          "CWE-862"
        ],
        "cna_assigner": "CIRCL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86408.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-86408",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 515034,
  "published_at": "2026-09-07T12:11:18.233+00:00"
}