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CVE-2016-9415

Status: ModifiedHigh (7.5)—

MyBB (aka MyBulletinBoard) before 1.8.8 on Windows and MyBB Merge System before 1.8.8 on Windows allow remote attackers to overwrite arbitrary CSS files via vectors related to "style import."

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Mybb — Merge SystemMybb — Mybb

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2016-9415",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
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  ],
  "published": "2017-01-31T22:59:01.533",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2016/11/10/8",
      "tags": [
        "Mailing List",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
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      "tags": [
        "Mailing List",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
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      "tags": [
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        "VDB Entry"
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://blog.mybb.com/2016/10/17/mybb-1-8-8-merge-system-1-8-8-release/",
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        "Patch",
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
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    {
      "url": "http://www.openwall.com/lists/oss-security/2016/11/10/8",
      "tags": [
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        "Patch",
        "Third Party Advisory"
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    },
    {
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      "tags": [
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    },
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      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://blog.mybb.com/2016/10/17/mybb-1-8-8-merge-system-1-8-8-release/",
      "tags": [
        "Patch",
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "MyBB (aka MyBulletinBoard) before 1.8.8 on Windows and MyBB Merge System before 1.8.8 on Windows allow remote attackers to overwrite arbitrary CSS files via vectors related to \"style import.\""
    },
    {
      "lang": "es",
      "value": "MyBB (también conocido como MyBulletinBoard) en versiones anteriores a 1.8.8 en Windows y MyBB Merge System en versiones anteriores a 1.8.8 en Windows permiten a atacantes remotos sobrescribir archivos CSS arbitrarios a través de vectores relacionados con \"importar estilo\"."
    }
  ],
  "lastModified": "2026-06-17T00:55:59.730",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "FC4E25F3-7C9D-45E3-8330-961A56BC3C48",
              "versionEndIncluding": "1.8.7"
            },
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              "vulnerable": true,
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      "operator": "AND"
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  ],
  "sourceIdentifier": "cve@mitre.org"
}