Microsoft App Installer vulnerabilities

3 CVEs affecting Microsoft App Installer, 1 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-68821, published 2026-08-11.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2021-43890: Microsoft Windows AppX Installer Spoofing Vulnerability, published 2021-12-15. High severity, CVSS 7.1. Actively exploited: in CISA KEV since 2021-12-15. EPSS: 11.3% chance of exploitation in the next 30 days. We have investigated reports of a spoofing vulnerability in AppX installer that affects Microsoft Windows. Microsoft is aware of attacks that attempt to exploit this vulnerability by using specially…
• CVE-2024-38177, published 2024-08-13. High severity, CVSS 7.8. EPSS: 0.9% chance of exploitation in the next 30 days. Windows App Installer Spoofing Vulnerability
• CVE-2026-68821, published 2026-08-11. High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days. Improper privilege management in Windows Package Manager allows an authorized attacker to elevate privileges locally.