CVE-2026-23656Network attack vector

Unauthenticated network spoofing

Published Mar 10, 2026 · Updated Mar 10, 2026

Authenticity verification failure in Microsoft Windows App Client for Windows Desktop before 2.0.964 allows remote attackers to spoof installer data. Microsoft has not published the validation locus or the installer data that the client accepts without sufficient authenticity verification. Exploitation requires a network path and high-complexity conditions, and successful attacks can alter trusted data without reported disclosure or service interruption.

CVSS severity5.9
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authenticity verification failure in Microsoft Windows App Client for Windows Desktop before 2.0.964 allows remote attackers to spoof installer data. Microsoft has not published the validation locus or the installer data that the client accepts without sufficient authenticity verification. Exploitation requires a network path and high-complexity conditions, and successful attacks can alter trusted data without reported disclosure or service interruption.

The record

CVE
CVE-2026-23656
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Microsoft
Product
Windows App Client for Windows Desktop
Classifications
CWE-345, CAPEC-148
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.00 <2.0.964

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows App Client for Windows Desktopversion=1.00 <2.0.964

Published CVSS scores

5.9Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CAPEC-148Content Spoofing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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