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CVE-2026-26168 Microsoft CVE debrief

The CVE-2026-26168 vulnerability is a high-severity elevation of privilege issue in Windows Ancillary Function Driver for WinSock, allowing an authorized attacker to elevate privileges locally. This vulnerability, classified as a race condition, is particularly concerning for defenders managing Windows systems, especially those in high-risk environments or with sensitive data. The CVE record, published on 2026-04-14T16:57:57.537Z, has not been modified since its publication. The NVD entry for this vulnerability is currently rated HIGH. Defenders should prioritize patching and verify the applicability of updates, ensuring system logs are monitored for suspicious activity, especially

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders managing Windows systems, especially those with high-risk environments or sensitive data, should prioritize patching and take immediate action. This includes verifying and applying updates, monitoring system logs for suspicious activity, and implementing additional security measures for high-risk environments. The vulnerability's impact on operators, platforms, and security teams necessitates a thorough

Why it matters

CVE-2026-26168 is a high-severity elevation of privilege vulnerability in Windows Ancillary Function Driver for WinSock. Defenders should prioritize patching, verify and apply updates, and monitor system logs for suspicious activity, especially in high-risk environments.

  • Potential privilege escalation
  • Increased risk of lateral movement
  • Possible data breaches or unauthorized access
  • Required verification of affected systems and patches

Technical summary

The vulnerability is a race condition in Windows Ancillary Function Driver for WinSock. This condition allows an authorized attacker to elevate privileges locally. The issue arises from concurrent execution using a shared resource with improper synchronization. The vulnerability's technical details are grounded in the CVE Program record and NVD vulnerability detail, which provide information on the affected product and the nature of the vulnerability.

Defensive priority

Defenders should prioritize patching Windows Ancillary Function Driver for WinSock vulnerabilities, especially in high-risk environments.

Recommended defensive actions

  • Patch affected Windows versions
  • Verify and apply updates
  • Monitor system logs for suspicious activity
  • Implement additional security measures for high-risk environments

Evidence notes

The CVE Program record and NVD vulnerability detail provide information on the vulnerability. Microsoft's advisory is available but requires external verification.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26168 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26168

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

  • CVE-2026-26168 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26168

    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.