CVE-2026-91803

Estado: En análisisAlta (8.8)—

A local privilege escalation vulnerability exists in the updater of Foxit PDF Editor/Reader due to unsafe loading of dynamic-link libraries from a user-writable directory during high-privilege operations. A local attacker could exploit this issue to execute code with elevated privileges.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.12%
Percentil entre todas las CVEs puntuadas: 1
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation95 %
Impacto principalT1574.007 Path Interception by PATH Environment Variablestealth · execution90 %
Impacto secundarioT1059.003 Windows Command Shellexecution75 %

Vulnerabilidad de escalada de privilegios local (AV:L, PR:L) en el actualizador de Foxit mediante carga insegura de DLL desde directorio escribible por usuario (CWE-427: DLL Hijacking). Permite ejecución de código con privilegios elevados.

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

Execution Prevention Threat Intelligence Program Restrict File and Directory Permissions Audit Application Isolation and Sandboxing Exploit Protection

Tecnologías afectadas (2)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Foxit — PDF Editor^AI Foxit — PDF Reader^AI

CWE

CWE-427

Referencias

https://www.foxit.com/support/security-bulletins.html

JSON original (NVD)

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{
  "id": "CVE-2026-91803",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-91803",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-23T14:40:30.695753Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "14984358-7092-470d-8f34-ade47a7658a2",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 2
      }
    ]
  },
  "affected": [
    {
      "source": "14984358-7092-470d-8f34-ade47a7658a2",
      "affectedData": [
        {
          "vendor": "Foxit Software Inc.",
          "product": "Foxit PDF Editor",
          "versions": [
            {
              "status": "affected",
              "version": "Versions 2026.2 and earlier"
            },
            {
              "status": "affected",
              "version": "Versions 14.0.7 and earlier"
            }
          ],
          "platforms": [
            "Windows"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "Foxit Software Inc.",
          "product": "Foxit PDF Reader",
          "versions": [
            {
              "status": "affected",
              "version": "Versions 2026.2 and earlier"
            }
          ],
          "platforms": [
            "Windows"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-23T08:17:12.363",
  "references": [
    {
      "url": "https://www.foxit.com/support/security-bulletins.html",
      "source": "14984358-7092-470d-8f34-ade47a7658a2"
    }
  ],
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "14984358-7092-470d-8f34-ade47a7658a2",
      "description": [
        {
          "lang": "en",
          "value": "CWE-427"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A local privilege escalation vulnerability exists in the updater of Foxit PDF Editor/Reader due to unsafe loading of dynamic-link libraries from a user-writable directory during high-privilege operations. A local attacker could exploit this issue to execute code with elevated privileges."
    }
  ],
  "lastModified": "2026-09-23T17:58:26.570",
  "sourceIdentifier": "14984358-7092-470d-8f34-ade47a7658a2"
}