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CVE-2009-4074

Status: ModifiedMedium (4.3)—

The XSS Filter in Microsoft Internet Explorer 8 allows remote attackers to leverage the "response-changing mechanism" to conduct cross-site scripting (XSS) attacks against web sites that have no inherent XSS vulnerabilities, related to the details of output encoding and improper modification of an HTML attribute, aka "XSS Filter Script Handling Vulnerability."

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 (1)

Microsoft — Internet Explorer

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2009-4074",
  "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
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2009-11-25T18:30:00.250",
  "references": [
    {
      "url": "http://hackademix.net/2009/11/21/ies-xss-filter-creates-xss-vulnerabilities/",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.owasp.org/images/5/50/OWASP-Italy_Day_IV_Maone.pdf",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/37135",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.theregister.co.uk/2009/11/20/internet_explorer_security_flaw/",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-002",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7715",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://hackademix.net/2009/11/21/ies-xss-filter-creates-xss-vulnerabilities/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.owasp.org/images/5/50/OWASP-Italy_Day_IV_Maone.pdf",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/37135",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.theregister.co.uk/2009/11/20/internet_explorer_security_flaw/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-002",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7715",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The XSS Filter in Microsoft Internet Explorer 8 allows remote attackers to leverage the \"response-changing mechanism\" to conduct cross-site scripting (XSS) attacks against web sites that have no inherent XSS vulnerabilities, related to the details of output encoding and improper modification of an HTML attribute, aka \"XSS Filter Script Handling Vulnerability.\""
    },
    {
      "lang": "es",
      "value": "El filtro XSS en Microsoft Internet Explorer v8 permite a atacantes remotos afianzar \"el mecanismo de cambio de respuesta\" para conducir un ataque de secuencias de comandos en sitios cruzados (XSS) contra paginas web que no tienen vulnerabilidades XSS, relacionado con la codificación de salida."
    }
  ],
  "lastModified": "2026-06-16T23:12:58.990",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:internet_explorer:8:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A52E757F-9B41-43B4-9D67-3FEDACA71283"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}