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PatchSiren cyber security CVE debrief

CVE-2026-108440 Microsoft CVE debrief

A CVE record for a stack-based buffer overflow in Microsoft Office Word was published. The vulnerability allows an unauthorized attacker to execute code over a network. This issue affects Microsoft Office Word deployments, which defenders should assess for exposure and potential impact. The CVE record provides limited information, and defenders should review the official advisory for affected scope, severity, and vendor guidance. The vulnerability has a high CVSS score of 8.8, indicating a significant risk.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-15
Original CVE updated
2026-10-16
Advisory published
2026-10-15
Advisory updated
2026-10-16

Who should care

Defenders responsible for Microsoft Office Word deployments should assess exposure and potential impact. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review the official advisory or CVE record to validate affected scope, severity, and vendor guidance. Prioritization is crucial due to the high CVSS score of 8.8, indicating a significant risk.

Why it matters

Defenders should prioritize verifying exposure and assessing potential impact of code execution in Microsoft Office Word deployments.

  • Code execution over a network requires verification
  • Potential impact on Microsoft Office Word deployments

Technical summary

A stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network. This vulnerability affects Microsoft Office Word deployments and requires defenders to assess exposure and potential impact. The technical details are based on the CVE record and NVD entry, which provide limited information about the vulnerability. Defenders should prioritize verifying exposure and assessing potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact.

Recommended defensive actions

  • Verify exposure to Microsoft Office Word
  • Assess potential impact of code execution
  • Monitor for updates from Microsoft

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Defenders should verify exposure and assess potential impact. The CVE record was published on 2026-10-15T21:17:09.493Z and has not been modified since then. Evidence is limited to CVE Program and NVD entries.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-108440 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-108440

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

  • CVE-2026-108440 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-108440

    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.