What is CVE-2026-23656?

CVE-2026-23656 is a medium-severity vulnerability in Microsoft Windows App Client For Desktop, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.9/10. Published 2026-03-10.

How severe is CVE-2026-23656?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Microsoft Windows App Client For Desktop

CVE-2026-23656

Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.

EPSS: 0.000 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C.

Affected products

Microsoft Windows App Client For Desktop — versions 1.00

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

Windows App Installer Spoofing Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-23656?: CVE-2026-23656 is a medium-severity vulnerability in Microsoft Windows App Client For Desktop, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.9/10. Published 2026-03-10.
How severe is CVE-2026-23656?: Medium severity. CVSS v3 base score is 5.9 out of 10.