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Aakash Rahsi
Aakash Rahsi

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CVE-2026-26123 | Microsoft Authenticator Information Disclosure Vulnerability

#cve202626123 #ai #authenticator #vulnerabilities

CVE-2026-26123 — Microsoft Authenticator — Sensitive data exposure across trust boundary

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CVE-2026-26123 | Microsoft Authenticator Information Disclosure Vulnerability

CVE-2026-26123 Microsoft Authenticator information disclosure insight into data context, trust boundaries, and secure identity behavior.

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  • Information disclosure shaped by local execution context and data handling
  • Affects Microsoft Authenticator environments on mobile platforms
  • Apply Microsoft guidance and review identity app exposure now

Executive Summary

Severity: CVSS 5.5 | Internal Rating: Medium

Business Impact: Sensitive data exposure, authentication context visibility, compliance considerations

Exploitability: Possible — requires local interaction context

Action Window: Patch now — identity workflows demand immediate assurance

What is the vulnerability

  • Type: Information Disclosure
  • Where: Microsoft Authenticator application flow
  • Trust Boundary: Data and identity context boundary

This reflects how execution context, local app handling, and trust boundaries can align within identity workflows.

Affected Scope

Area Details
Product Microsoft Authenticator
Platforms Mobile
Deployment Android / iOS
Preconditions Local device context, user interaction path

Attack Narrative

An actor reaches a valid local application surface.

The system processes data within its intended execution context.

This can create visibility alignment across a sensitive trust boundary.

Outcome: disclosure of information within a locally permitted context.

Detection Guidance

  • Review mobile identity app events
  • Monitor unusual app-to-app interaction patterns
  • Observe unexpected authentication context exposure
  • Track irregular sign-in flow behavior

Mitigation & Remediation

Primary: Apply Microsoft updates

Compensating Controls:

  • Limit unnecessary mobile app exposure
  • Enforce device hygiene and least privilege
  • Review identity app access paths

Long-Term:

  • Strengthen mobile identity governance
  • Audit trust boundaries in authentication flows

Risk Rating

Factor Score
Likelihood 3
Impact 3
Detectability 3
Overall Medium

Notes: Local execution context shapes exposure.

Stakeholder Impact

  • CISO Office
  • IAM Teams
  • Mobile Security / IT Ops

FAQ

  • Are we affected? → If Microsoft Authenticator is deployed on managed devices
  • What changed? → Interpretation of local trust boundary behavior
  • What are we doing? → Updating and reviewing identity handling controls

References

  • Microsoft MSRC Advisory
  • NVD / CNA Entry

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