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CVE-2026-86408 (GCVE-0-2026-86408)

Vulnerability from cvelistv5 – Published: 2026-09-07 12:11 – Updated: 2026-09-07 12:11
VLAI
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
Severity
7.1 (High)
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
CWE
  • CWE-862 - Missing Authorization
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
Impacted products
Vendor Product Version CPE status
MISP MISP Affected: 0 , ≤ 2.5.45 (semver)
guessed Create a notification for this product.
Credits
Scottish Government - National Cyber Team iglocska Claude Opus 5 (1M context)
Show details on NVD website
To clipboard 

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          "programFiles": [
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          "type": "finder",
          "value": "Scottish Government - National Cyber Team"
        },
        {
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          "type": "remediation developer",
          "value": "iglocska"
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          "type": "remediation developer",
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            "Recovery": "NOT_DEFINED",
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            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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            "valueDensity": "NOT_DEFINED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "shortName": "CIRCL"
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          "url": "https://github.com/MISP/MISP/commit/2edde619b"
        }
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      "source": {
        "discovery": "UNKNOWN"
      },
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    "assignerShortName": "CIRCL",
    "cveId": "CVE-2026-86408",
    "datePublished": "2026-09-07T12:11:18.233Z",
    "dateReserved": "2026-09-07T12:11:12.888Z",
    "dateUpdated": "2026-09-07T12:11:18.233Z",
    "state": "PUBLISHED"
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  }
}



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