CVE-2026-64914 Microsoft CVE debrief

Who should care

Defenders responsible for Microsoft Office and Microsoft 365 Apps for Enterprise deployments should assess exposure and prioritize patching vulnerable versions.

Why it matters

CVE-2026-64914 is a high-severity vulnerability in Microsoft Access that allows remote code execution. Defenders should prioritize patching vulnerable versions to prevent potential local code execution by unauthorized attackers. This requires verifying affected versions, inventorying vulnerable systems, and monitoring for potential exploitation attempts.

• Potential local code execution by unauthorized attackers
• Need to verify affected versions and inventory vulnerable systems
• Priority on patching and updating vulnerable Microsoft Office and Microsoft 365 Apps for Enterprise versions
• Monitoring for potential exploitation attempts

Technical summary

A heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally, with a CVSS score of 7.8 and HIGH severity. The vulnerability affects Microsoft Office Access and potentially Microsoft 365 Apps for Enterprise. Defenders should prioritize patching vulnerable Microsoft Office and Microsoft 365 Apps for Enterprise versions to prevent potential local code execution.

Defensive priority

Defenders should prioritize patching vulnerable Microsoft Office and Microsoft 365 Apps for Enterprise versions to prevent potential local code execution.

Recommended defensive actions

• Patch vulnerable Microsoft Office and Microsoft 365 Apps for Enterprise versions
• Inventory and verify affected systems
• Monitor for potential exploitation attempts

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional information on exploitation and impact is limited. There is no information on known or unknown affected scope. Defenders should verify affected versions and inventory vulnerable systems. The official CVE Program record and NIST NVD detail page provide source-provided CVE metadata and source-specific vulnerability assessment.

Sources and 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.