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PatchSiren cyber security CVE debrief

CVE-2026-70262 Microsoft CVE debrief

A heap-based buffer overflow vulnerability in WebDAV allows an unauthorized attacker to elevate privileges over a network. Multiple Windows versions and server releases are affected, including Windows 10, Windows 11, and Windows Server 2012 through 2025. The vulnerability can be exploited over untrusted networks, and defenders should prioritize patching affected systems, especially those exposed to the internet or untrusted networks. The CVE Program and NVD provide official records of the vulnerability, and Microsoft has released a patch for the affected systems.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows systems, especially those exposed to the internet or untrusted networks, should prioritize patching affected systems.

Why it matters

CVE-2026-70262 is a high-severity vulnerability in WebDAV that allows elevation of privileges. Defenders should prioritize patching affected Windows systems, especially those exposed to the internet or untrusted networks.

  • Potential elevation of privileges by unauthorized attackers
  • Possible exploitation over untrusted networks
  • Requires verification of affected versions and exposure
  • Patching priority for Windows systems

Technical summary

A heap-based buffer overflow vulnerability exists in WebDAV, allowing an unauthorized attacker to elevate privileges over a network. The vulnerability affects multiple Windows versions, including Windows 10, Windows 11, and Windows Server 2012 through 2025.

Defensive priority

Defenders should prioritize patching affected Windows systems, especially those exposed to the internet or untrusted networks.

Recommended defensive actions

  • Patch affected Windows systems
  • Verify and apply Microsoft's security updates
  • Monitor systems for unusual activity
  • Restrict WebDAV access to trusted networks

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the affected systems. The vulnerability affects multiple Windows versions, including Windows 10, Windows 11, and Windows Server 2012 through 2025. Defenders should verify affected scope, severity, and vendor guidance. The official CVE Program record and NVD vulnerability detail page provide source-provided CVE metadata and vulnerability assessment.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70262 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70262

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-70262 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70262

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • WebDAV Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/70xxx/CVE-2026-70262.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70262

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.