CVE-2026-88243

Critical (9.8)—

Schedule the patchSeverity Critical 9.8. No public exploit or active exploitation known.

Vendor advisory· Microsoft MSRC

Severity9.8Critical · CVSS 3.1

Exploitation probability1.01 %higher than 63% of CVEs · score from Nov 11, 2026

Active exploitationNonot in the CISA catalog · checked Nov 12, 03:00 AM

Public exploitNot knownno public code found

News and reports on Orbitaley

Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to execute code over a network.

Timeline

Built from our own data: NVD, CISA KEV and other exploitation catalogues, FIRST EPSS, public exploits, specialised media and Orbitaley coverage.

Nov 10, 2026CVE record published in NVD
Nov 10, 2026Alert: Microsoft fixes 200 vulnerabilities, including an Outlook flaw CISA confirms is being exploited

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access92 %
Primary impactT1059 Command and Scripting Interpreterexecution85 %

El vector AV:N/PR:N/UI:N indica explotación remota sin autenticación ni interacción; la descripción dice que permite ejecutar código por red, sin especificar intérprete, por lo que se usa T1059.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Privileged Account Management Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation Limit Access to Resource Over Network

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Microsoft — Windows Dhcp Server^AI

NVD record

NVD status: Awaiting Analysis
Published: Nov 10, 2026
Last modified: Nov 11, 2026
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125

References

Referencemsrc.microsoft.com/update-guide/vulnerability/CVE-2026-88243

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-88243",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-88243",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-11-05T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
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        "cvssData": {
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 3.9
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          "product": "Windows Server 2022",
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        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2025",
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  "published": "2026-11-10T19:21:33.783",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88243",
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
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    {
      "lang": "en",
      "value": "Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to execute code over a network."
    }
  ],
  "lastModified": "2026-11-11T05:19:54.337",
  "sourceIdentifier": "secure@microsoft.com"
}