Vulnerability in Microsoft Windows App
CVE-2026-23656
Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (19.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Microsoft Windows App
- Microsoft Windows App Client For Desktop — versions 1.00
Weakness classification (CWE)
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656 (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-23656?
- CVE-2026-23656 is a medium-severity vulnerability in Microsoft Windows App, 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.