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CVE-2020-15159

Status: ModifiedHigh (7.6)—

baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.

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)

Basercms — Basercms

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2020-15159",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.6,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
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        "impactScore": 6,
        "exploitabilityScore": 1
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      {
        "type": "Primary",
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        "cvssData": {
          "scope": "CHANGED",
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          "baseSeverity": "HIGH",
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          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
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          "confidentialityImpact": "HIGH"
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  "affected": [
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      "affectedData": [
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          "vendor": "baserproject",
          "product": "basercms",
          "versions": [
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              "version": "unspecified",
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              "versionType": "custom"
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  ],
  "published": "2020-08-28T22:15:10.657",
  "references": [
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      "url": "https://basercms.net/security/20200827",
      "tags": [
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      "source": "security-advisories@github.com"
    },
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      "url": "https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d",
      "tags": [
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        "Third Party Advisory"
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      "source": "security-advisories@github.com"
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      "url": "https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
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      "tags": [
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    },
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      "url": "https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d",
      "tags": [
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7."
    },
    {
      "lang": "es",
      "value": "baserCMS versiones 4.3.6 y anteriores, esta afectado por una vulnerabilidad de tipo Cross Site Scripting (XSS) y Remote Code Execution (RCE). Esta puede ser ejecutada al iniciar sesión como administrador del sistema y cargando un archivo de script ejecutable tal y como un archivo PHP. Los componentes afectados son los archivos ThemeFilesController.php y UploaderFilesController.php. Esto es corregido en la versión 4.3.7"
    }
  ],
  "lastModified": "2026-06-17T02:56:10.110",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3D8C0605-796C-4AA8-ACD8-1444D95A121B",
              "versionEndIncluding": "4.3.6"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}