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CVE-2026-8863

Estado: AplazadaAlta (7.8)—

Multiple Microsoft-sigend UEFI SHIM bootloaders are vulnerable to SecureBoot bypass. An attacker with administrative privileges or the ability to modify the boot process could use one of the vulnerable shim bootloaders to bypass Secure Boot protections and execute arbitrary code before the operating system loads. Specific UEFI DBX update is required to block these vulnerable boot loaders.

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.

AV:L PR:L sin UI permite escalar desde admin local modificando bootloader UEFI. Impacto: ejecución de código arbitrario pre-SO y potencial modificación de parámetros de arranque.

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 PreventionAuditUser Account ManagementThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account Management

Tecnologías afectadas (1)

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

Microsoft — Uefi Shim BootloaderAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-8863",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-8863",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-09T19:03:03.811729Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "cret@cert.org",
      "affectedData": [
        {
          "vendor": "Oracle Corporation",
          "product": "OracleLinux(7.2) shim",
          "versions": [
            {
              "status": "affected",
              "version": "0.9"
            }
          ]
        },
        {
          "vendor": "PC-Doctor",
          "product": "Service Center Enterprise",
          "versions": [
            {
              "status": "affected",
              "version": "14",
              "versionType": "custom",
              "lessThanOrEqual": "17.0.7536.900"
            }
          ]
        },
        {
          "vendor": "PC-Doctor",
          "product": "Service Center Drive Erase",
          "versions": [
            {
              "status": "affected",
              "version": "15",
              "versionType": "custom",
              "lessThanOrEqual": "17.0.7538.592"
            }
          ]
        },
        {
          "vendor": "PC-Doctor",
          "product": "Service Center Japan",
          "versions": [
            {
              "status": "affected",
              "version": "15",
              "versionType": "custom",
              "lessThanOrEqual": "17.0.7539.904"
            }
          ]
        },
        {
          "vendor": "PC-Doctor",
          "product": "Service Center",
          "versions": [
            {
              "status": "affected",
              "version": "14",
              "versionType": "custom",
              "lessThanOrEqual": "17.0.7535.900"
            }
          ]
        },
        {
          "vendor": "PC-Doctor",
          "product": "Network Factory for Linux (Bootable Diagnostics)",
          "versions": [
            {
              "status": "affected",
              "version": "6.9",
              "versionType": "custom",
              "lessThanOrEqual": "6.20.7711.267"
            }
          ]
        },
        {
          "vendor": "PC-Doctor",
          "product": "Factory for Linux (Bootable Diagnostics)",
          "versions": [
            {
              "status": "affected",
              "version": "6.9",
              "versionType": "custom",
              "lessThanOrEqual": "6.20.7710.267"
            }
          ]
        },
        {
          "vendor": "Spyrus",
          "product": "WTGCreator",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            }
          ]
        },
        {
          "vendor": "Blancco UK",
          "product": "WhiteCanyon WipeDrive",
          "versions": [
            {
              "status": "affected",
              "version": "8.0.0",
              "versionType": "custom",
              "lessThanOrEqual": "8.1.3"
            }
          ]
        },
        {
          "vendor": "baramundi software",
          "product": "baramundi Management Suite",
          "versions": [
            {
              "status": "affected",
              "version": "*",
              "versionType": "custom",
              "lessThanOrEqual": "2024R1"
            }
          ]
        },
        {
          "vendor": "SUSE Linux",
          "product": "OpenSUSE shim",
          "versions": [
            {
              "status": "affected",
              "version": "0.9"
            }
          ]
        },
        {
          "vendor": "Finland Matriculation Board",
          "product": "Abitti 1",
          "versions": [
            {
              "status": "affected",
              "version": "1.0.0"
            }
          ]
        },
        {
          "vendor": "NTC IT ROSA LLC",
          "product": "RosaLinux",
          "versions": [
            {
              "status": "affected",
              "version": "R9"
            }
          ]
        },
        {
          "vendor": "NTC IT ROSA LLC",
          "product": "RosaLinux",
          "versions": [
            {
              "status": "affected",
              "version": "R10"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-09T19:17:59.210",
  "references": [
    {
      "url": "https://kb.cert.org/vuls/id/616257",
      "source": "cret@cert.org"
    },
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863",
      "source": "cret@cert.org"
    },
    {
      "url": "https://www.kb.cert.org/vuls/id/616257",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "Multiple Microsoft-sigend UEFI SHIM bootloaders are vulnerable to SecureBoot bypass. An attacker with administrative privileges or the ability to modify the boot process could use one of the vulnerable shim bootloaders to bypass Secure Boot protections and execute arbitrary code before the operating system loads. Specific UEFI DBX update is required to block these vulnerable boot loaders."
    },
    {
      "lang": "es",
      "value": "Múltiples cargadores de arranque UEFI SHIM firmados por Microsoft son vulnerables a una omisión de SecureBoot. Un atacante con privilegios administrativos o la capacidad de modificar el proceso de arranque podría usar uno de los cargadores de arranque shim vulnerables para eludir las protecciones de Secure Boot y ejecutar código arbitrario antes de que el sistema operativo cargue. Se requiere una actualización específica de UEFI DBX para bloquear estos cargadores de arranque vulnerables."
    }
  ],
  "lastModified": "2026-07-23T09:10:00.113",
  "sourceIdentifier": "cret@cert.org"
}