Medium severity · published Mar 10, 2026
CVE-2026-23656
Windows App Installer Spoofing Vulnerability
5.9
CVSS
0.3%
EPSS
No
On KEV
Description
Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
Windows App Client for Windows Desktop · Microsoft
1.00 before 2.0.964 · source: vendor
WA
Windows App · Microsoft
before 2.0.964.0 · source: NVD
Affected product
WA
Windows App Client for Windows Desktop
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23656
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23656
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656
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