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Aakash Rahsi
Aakash Rahsi

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CVE-2026-26144 | Microsoft Excel Information Disclosure Vulnerability

#cve202626144 #ai #excel #vulnerabilities

CVE-2026-26144 — Microsoft Excel — Data context exposure across trust boundary

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CVE-2026-26144 | Microsoft Excel Information Disclosure Vulnerability

CVE-2026-26144 Microsoft Excel information disclosure insight into data context, trust boundaries, and secure document handling behavior.

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  • Data context interpretation influences visibility across execution context
  • Affects Microsoft Excel document handling environments
  • Apply updates and review data handling controls

Executive Summary

Severity: Medium–High (CVSS aligned)

Business Impact: Potential unintended data visibility, document context exposure, compliance considerations

Exploitability: Possible — depends on document and execution context

Action Window: Patch now — data-bound workflows require consistency

What is the vulnerability

  • Type: Information Disclosure
  • Where: Microsoft Excel document processing
  • Trust Boundary: Data context boundary

This reflects how data interpretation and execution context interact within document workflows.

Affected Scope

Area Details
Product Microsoft Excel
Model Desktop / Cloud
Preconditions Document interaction, permitted context

Attack Narrative

An actor introduces structured content into a document surface.

The system processes data within its execution context.

This leads to data visibility alignment beyond intended contextual scope.

Outcome: exposure within permitted but expanded boundaries.

Detection Guidance

  • Review document access logs
  • Monitor unusual data access patterns
  • Observe unexpected content rendering behavior
  • Track abnormal document interaction flows

Mitigation & Remediation

Primary: Apply Microsoft updates

Compensating Controls:

  • Restrict document sources
  • Enforce least privilege access
  • Apply data classification policies

Long-Term:

  • Strengthen data governance
  • Review document trust boundaries

Risk Rating

Factor Score
Likelihood 3
Impact 4
Detectability 3
Overall Medium–High

Notes: Data-context interpretation drives exposure.

Stakeholder Impact

  • Security & Compliance Teams
  • IT Operations
  • Data Governance Teams

FAQ

  • Are we affected? → If using Excel in enterprise workflows
  • What changed? → Contextual data interpretation
  • What now? → Update and review data controls

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