CVE intelligence and bounded remediation

CVE-2020-0943 — Microsoft Your Phone Companion security vulnerability

Medium CVSS 4.6

An authentication bypass vulnerability exists in Microsoft YourPhoneCompanion application for Android, in the way the application processes notifications generated by work profiles.This could allow an unauthenticated attacker to view notifications, aka 'Microsoft YourPhone Application for Android Authentication Bypass Vulnerability'.

Severity
Medium
CVSS
4.6 (3.1)
Published
2020-04-15
CISA KEV
Not currently listed
Ecosystem
windows/system

Affected products

  • microsoft / your_phone_companion

Matched remediation archetype

Authentication bypass and missing authentication

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.