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CVE-2026-21623

Estado: AnalizadaCrítica (9.4)—

Lack of input filterung leads to a persistent XSS vulnerability in the forum post handling of the Easy Discuss component for Joomla.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

XSS persistente en manejo de posts (CWE-79, descripción explícita). AV:N/UI:P/PR:L indica navegador web. Ejecuta JavaScript, accede a datos de sesión/credenciales.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Restrict Web-Based ContentDisable or Remove Feature or ProgramUser TrainingUser Account ManagementRestrict File and Directory PermissionsPrivileged Account Management

Tecnologías afectadas (1)

Stackideas — Easydiscuss

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-21623",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-21623",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-16T15:37:45.502136Z"
        }
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    ],
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        "source": "nvd@nist.gov",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
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        "type": "Secondary",
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          "Automatable": "NOT_DEFINED",
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          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
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          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
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          "subConfidentialityImpact": "HIGH",
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          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
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  },
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    {
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      "affectedData": [
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          "product": "EasyDiscuss extension for Joomla",
          "versions": [
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            }
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  ],
  "published": "2026-01-16T15:15:54.733",
  "references": [
    {
      "url": "https://stackideas.com/easydiscuss",
      "tags": [
        "Product"
      ],
      "source": "security@joomla.org"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@joomla.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Lack of input filterung leads to a persistent XSS vulnerability in the forum post handling of the Easy Discuss component for Joomla."
    },
    {
      "lang": "es",
      "value": "Falta de filtrado de entrada conduce a una vulnerabilidad XSS persistente en el manejo de publicaciones del foro del componente Easy Discuss para Joomla."
    }
  ],
  "lastModified": "2026-06-17T10:18:49.543",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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          "operator": "OR"
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}