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PatchSiren cyber security CVE debrief

CVE-2026-81394 Microsoft CVE debrief

Microsoft Office Excel vulnerability allows unauthorized information disclosure. Defenders should assess exposure and prioritize patching to prevent local information disclosure attacks. This CVE-2026-81394 vulnerability affects Microsoft Office Excel, enabling unauthorized attackers to disclose information locally. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. Defenders responsible for Microsoft Office deployments should assess exposure and prioritize patching to mitigate potential risks.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-17
Advisory published
2026-09-08
Advisory updated
2026-09-17

Who should care

Defenders responsible for Microsoft Office deployments, security teams, and IT personnel should assess exposure and prioritize patching for CVE-2026-81394. This vulnerability affects Microsoft Office Excel, enabling unauthorized attackers to disclose information locally. Defenders should review inventory of Microsoft Office versions and configurations, assess exposure of Microsoft Office Excel in their environment,

Why it matters

CVE-2026-81394 vulnerability in Microsoft Office Excel allows unauthorized information disclosure, requiring defenders to assess exposure and prioritize patching

  • Verify inventory of Microsoft Office versions and configurations
  • Assess exposure of Microsoft Office Excel in your environment
  • Prioritize patching for CVE-2026-81394

Technical summary

CVE-2026-81394 is a vulnerability in Microsoft Office Excel that allows an unauthorized attacker to disclose information locally. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. This vulnerability affects Microsoft Office Excel, enabling unauthorized information disclosure. Defenders should assess exposure and prioritize patching to prevent local information disclosure attacks.

Defensive priority

Assess exposure, prioritize patching

Recommended defensive actions

  • Review and apply Microsoft patch for CVE-2026-81394
  • Assess exposure of Microsoft Office Excel in your environment
  • Verify inventory of Microsoft Office versions and configurations

Evidence notes

Official CVE Program record and NIST NVD detail page provide information on CVE-2026-81394, a vulnerability in Microsoft Office Excel that allows unauthorized information disclosure.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-81394 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-81394

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

  • CVE-2026-81394 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-81394

    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.