CVE-2009-5031

Status: ModifiedMedium (4.3)—
ModSecurity before 2.5.11 treats request parameter values containing single quotes as files, which allows remote attackers to bypass filtering rules and perform other attacks such as cross-site scripting (XSS) attacks via a single quote in a request parameter in the Content-Disposition field of a request with a multipart/form-data Content-Type header.
CVSS

Version: 2.0
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Base score: 4.3
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 2.93%
Percentile among all scored CVEs: 87
Score date: 10/3/2026
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)

Opensuse — Opensuse Trustwave — Modsecurity
CWEs

CWE-79
References

Raw JSON (NVD)

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{
  "id": "CVE-2009-5031",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
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          "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
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  },
  "affected": [
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      "affectedData": [
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          "versions": [
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  "published": "2012-07-22T16:55:17.307",
  "references": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
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  "descriptions": [
    {
      "lang": "en",
      "value": "ModSecurity before 2.5.11 treats request parameter values containing single quotes as files, which allows remote attackers to bypass filtering rules and perform other attacks such as cross-site scripting (XSS) attacks via a single quote in a request parameter in the Content-Disposition field of a request with a multipart/form-data Content-Type header."
    },
    {
      "lang": "es",
      "value": "ModSecurity v2.5.11 trata los valores de los parámetros de solicitud que contienen comillas simples como archivos, permite a atacantes remotos eludir las reglas de filtrado y llevar a cabo otros ataques como secuencias de comandos en sitios cruzados (XSS) a través de una única oferta en un parámetro de la petición en el campo Content-Disposition de una solicitud con un encabezado multipart/form-data Content-Type"
    }
  ],
  "lastModified": "2026-06-16T23:14:51.810",
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