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CVE-2015-8976

Estado: ModificadaMedia (6.1)—

Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 might allow remote attackers to inject arbitrary web script or HTML via vectors related to "old upgrade files."

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Mybb — Merge SystemMybb — Mybb

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2015-8976",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2017-01-31T22:59:00.267",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2016/11/10/8",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2016/11/18/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/94397",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2016/11/10/8",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2016/11/18/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/94397",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://blog.mybb.com/2015/09/07/mybb-1-8-6-1-6-18-merge-system-1-8-6-release/",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cross-site scripting (XSS) vulnerability in MyBB (aka MyBulletinBoard) before 1.6.18 and 1.8.x before 1.8.6 and MyBB Merge System before 1.8.6 might allow remote attackers to inject arbitrary web script or HTML via vectors related to \"old upgrade files.\""
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de XSS en MyBB (también conocido como MyBulletinBoard) en versiones anteriores a 1.6.18 y 1.8.x en versiones anteriores a 1.8.6 y MyBB Merge System en versiones anteriores a 1.8.6 podrían permitir a atacantes remotos inyectar secuencias de comandos web o HTML arbitrarios a través de vectores relacionados con \"archivos antiguos de actualización\"."
    }
  ],
  "lastModified": "2026-06-17T00:35:36.167",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mybb:merge_system:1.8.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "84DB6EE0-4972-434D-9C89-7BD9EB4896B7"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2FF6F484-A280-45A6-BB5E-B923339B7109",
              "versionEndIncluding": "1.6.17"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:1.8.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E697D13C-5594-491B-B911-3B4BEA00AFCC"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:1.8.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "00724054-858F-4322-8BE5-F6929CC2CAD8"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:1.8.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "95998F68-1F16-4FEA-BDE3-957235D04881"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:1.8.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "927F9547-773B-4F2C-8870-AA3672EEC7CA"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:1.8.4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6817FA9E-51B7-4ADE-86E2-E9F559A585EC"
            },
            {
              "criteria": "cpe:2.3:a:mybb:mybb:1.8.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "667EFFF1-E5C1-4124-BD0B-D4244FAECE15"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}