CVE-2026-8661

{
  "id": "CVE-2026-8661",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-26T02:16:54.640",
  "lastModified": "2026-10-25T22:10:00.150",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Server-Side Request Forgery in the markdown_to_pdf action of Rapid7 InsightConnect Markdown Plugin on Linux in versions prior to 4.0.2 allows remote attackers to make arbitrary outbound HTTP requests via unsanitized resource-loading HTML elements (img/src, CSS url(), @import) embedded in Markdown input. The initial fix in 4.0.0 disabled JavaScript but did not neutralize resource-loading vectors. Resolved in 4.0.2 by sanitizing HTML with an allowlist of tags, attributes, and URL schemes."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de cross-site scripting del lado del servidor y de falsificación de petición del lado del servidor en la acción markdown_to_pdf del plugin Rapid7 InsightConnect Markdown versión 3.1.4 y anteriores en Linux permite a atacantes remotos ejecutar JavaScript del lado del servidor y realizar peticiones HTTP salientes arbitrarias a través de contenido manipulado incrustado en la entrada Markdown. El motor de renderizado de PDF no restringe la ejecución de scripts ni el acceso a la red saliente."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Rapid7",
          "product": "InsightConnect Markdown Plugin",
          "defaultStatus": "unaffected",
          "platforms": [
            "Linux"
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "4.0.2",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "4.0.2",
              "versionType": "custom",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 4.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-26T12:23:45.269146Z",
          "id": "CVE-2026-8661",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/rapid7/insightconnect-plugins/blob/master/plugins/markdown/help.md",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/rapid7/insightconnect-plugins/pull/3721",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/rapid7/insightconnect-plugins/pull/4010",
      "source": "[email protected]"
    }
  ]
}