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CVE-2026-18676

Full vulnerability record from the local CVENow database.

Description

The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.

Severity
MEDIUM
CVSS score
5.1 (v4.0)
Vulnerability status
Awaiting Analysis
Source identifier
02762ae7-200e-4b20-9b2b-a77d5b8fc4cb
Published
2026-08-12 19:17:30.813000
Last modified
2026-10-23 19:10:00.167000
View original CVE JSON 
{
  "id": "CVE-2026-18676",
  "sourceIdentifier": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb",
  "published": "2026-08-12T19:17:30.813",
  "lastModified": "2026-10-23T19:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material."
    },
    {
      "lang": "es",
      "value": "La configuración predeterminada de kuma-cp en Kong Mesh revela el token de arranque de administrador y las claves de firma a cualquier página web que el operador visita mientras el plano de control es accesible desde su navegador. Debido a una configuración incorrecta de CORS, una llamada fetch() de origen cruzado desde una página maliciosa devuelve el JWT de administrador y el material de firma."
    }
  ],
  "affected": [
    {
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb",
      "affectedData": [
        {
          "vendor": "Kong Inc.",
          "product": "Kong Mesh",
          "defaultStatus": "unaffected",
          "modules": [
            "kuma-cp"
          ],
          "platforms": [
            "Linux"
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "2.7.25",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.8.0",
              "lessThan": "2.9.15",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.10.0",
              "lessThan": "2.11.13",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.12.0",
              "lessThan": "2.12.10",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "2.13.0",
              "lessThan": "2.13.5",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 5.1,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "ACTIVE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-13T14:50:34.609630Z",
          "id": "CVE-2026-18676",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-346"
        },
        {
          "lang": "en",
          "value": "CWE-942"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://developer.konghq.com/mesh/changelog/",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/pull/16416",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/pull/16423",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/pull/16424",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/pull/16425",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/pull/16426",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/pull/16427",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    },
    {
      "url": "https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2",
      "source": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"
    }
  ]
}