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CVE-2021-39340

Estado: ModificadaMedia (4.8)—

The Notification WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/src/classes/Utils/Settings.php file which made it possible for attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 7.2.4. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

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 (1)

Bracketspace — Notification

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-39340",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-39340",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-03-31T17:45:49.361830Z"
        }
      }
    ],
    "cvssMetricV2": [
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        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "security@wordfence.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 1.7
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        {
          "vendor": "Notification – Custom Notifications and Alerts for WordPress",
          "product": "Notification – Custom Notifications and Alerts for WordPress",
          "versions": [
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              "version": "7.2.4",
              "versionType": "custom",
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  "published": "2021-11-01T21:15:07.807",
  "references": [
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      "tags": [
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        "Third Party Advisory"
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      "source": "security@wordfence.com"
    },
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      "url": "https://plugins.trac.wordpress.org/browser/notification/tags/7.2.4/src/classes/Utils/Settings.php#L167",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security@wordfence.com"
    },
    {
      "url": "https://wordfence.com/vulnerability-advisories/#CVE-2021-39340",
      "tags": [
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      ],
      "source": "security@wordfence.com"
    },
    {
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      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@wordfence.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Notification WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/src/classes/Utils/Settings.php file which made it possible for attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 7.2.4. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled."
    },
    {
      "lang": "es",
      "value": "El plugin Notification de WordPress es vulnerable a un ataque de tipo Cross-Site Scripting Almacenado debido a una comprobación  insuficiente y saneamiento de entradas por medio de varios parámetros encontrados en el archivo ~/src/classes/Utils/Settings.php que hacen posible a atacantes con acceso de usuario administrativo inyectar scripts web arbitrarios, en versiones hasta 7.2.4 incluyéndola. Esto afecta a las instalaciones multisitio en las que unfiltered_html está deshabilitado para los administradores, y a los sitios en los que unfiltered_html está deshabilitado"
    }
  ],
  "lastModified": "2026-06-17T04:03:34.760",
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    {
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          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "D7F7A9C5-5BE9-4AC3-8A76-60321023E113",
              "versionEndIncluding": "7.2.4"
            }
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          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "security@wordfence.com"
}