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CVE-2026-71336 Microsoft CVE debrief

CVE-2026-71336 is an integer overflow or wraparound vulnerability in the Windows Work Folder Service that allows an authorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. Microsoft has provided a patch for this vulnerability. System administrators and security teams should assess exposure, especially for systems on untrusted networks, and apply patches immediately. The vulnerability exists in the Windows Work Folder Service and allows an authorized attacker to execute code over a network due to an integer overflow or wraparound. Affected systems include Windows 10, Windows Server 2012, 2016, 2019, 2022, and 202

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-16
Advisory published
2026-09-08
Advisory updated
2026-09-16

Who should care

System administrators and security teams responsible for Windows systems, especially those exposed to untrusted networks, should assess exposure and apply patches immediately.

Why it matters

CVE-2026-71336 is a high-severity vulnerability in Windows Work Folder Service that allows authorized attackers to execute code over a network. System administrators and security teams should assess exposure, especially for systems on untrusted networks, and apply patches immediately.

  • Authorized attackers can execute code over a network, potentially leading to system compromise.
  • Exposure to untrusted networks increases the risk of exploitation.
  • Patches are available and should be applied immediately to mitigate the vulnerability.
  • Verification of patch application and system configuration is necessary to ensure protection.

Technical summary

The vulnerability exists in the Windows Work Folder Service and allows an authorized attacker to execute code over a network due to an integer overflow or wraparound. Affected systems include Windows 10, Windows Server 2012, 2016, 2019, 2022, and 2025.

Defensive priority

Apply patches immediately, especially for systems exposed to untrusted networks.

Recommended defensive actions

  • Apply patches immediately, especially for systems exposed to untrusted networks.
  • Verify and apply patches for Windows 10, Windows Server 2012, 2016, 2019, 2022, and 2025 systems.
  • Review network configurations to limit exposure to untrusted networks.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and affected systems. The vulnerability has been patched by Microsoft, and patches should be applied immediately, especially for systems exposed to untrusted networks. Verification of patch application and system configuration is necessary to ensure protection. The CVE record was published on 2026-09-08T18:20:13.287Z and has not been modified since then. Additional information can be found in

Sources and references

Verified primary and authoritative sources

  • CVE-2026-71336 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-71336

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

  • CVE-2026-71336 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-71336

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

Supplemental references

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.