« Volver al listado

CVE-2026-8931

Estado: AplazadaCrítica (9.4)—

A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3.

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.

Vector CVSS con UI:P (interacción del usuario) y RCE en aplicación web sugiere explotación T1203. CWE-94 (improper control of generation of code) y mención explícita de RCE confirman ejecución de código como impacto principal.

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 ContentPrivileged Account ManagementLimit Software InstallationExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or Program

Tecnologías afectadas (1)

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

Disig — WEB SignerAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-8931",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-8931",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-01T15:31:29.743050Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "incident@nbu.gov.sk",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 9.4,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "PASSIVE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "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"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "incident@nbu.gov.sk",
      "affectedData": [
        {
          "vendor": "Disig",
          "product": "Web Signer",
          "versions": [
            {
              "status": "affected",
              "version": "2.0.3",
              "versionType": "custom",
              "lessThanOrEqual": "2.5.3"
            },
            {
              "status": "unaffected",
              "version": "2.5.5"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-06-01T15:16:39.220",
  "references": [
    {
      "url": "https://download.disigcdn.sk/cdn/products/websigner2/changelog.en.txt",
      "source": "incident@nbu.gov.sk"
    },
    {
      "url": "https://download.disigcdn.sk/cdn/products/websigner2/changelog.sk.txt",
      "source": "incident@nbu.gov.sk"
    },
    {
      "url": "https://qesportal.sk/Portal/en/Info/News#websigner255",
      "source": "incident@nbu.gov.sk"
    },
    {
      "url": "https://qesportal.sk/Portal/sk/Info/News#websigner255",
      "source": "incident@nbu.gov.sk"
    },
    {
      "url": "https://www.disig.sk/en/news/important-update-of-the-web-signer-application/",
      "source": "incident@nbu.gov.sk"
    },
    {
      "url": "https://www.disig.sk/sk/aktuality/dolezita-aktualizacia-aplikacie-web-signer/",
      "source": "incident@nbu.gov.sk"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A critical Remote Code Execution (RCE) vulnerability exists in Disig Web Signer versions 2.0.3 through 2.5.3."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad crítica de ejecución remota de código (RCE) en las versiones 2.0.3 a 2.5.3 de Disig Web Signer."
    }
  ],
  "lastModified": "2026-07-22T07:10:00.107",
  "sourceIdentifier": "incident@nbu.gov.sk"
}