CVE-2026-23656: CWE-345: Insufficient Verification of Data Authenticity in Microsoft Windows App Client for Windows Desktop
Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-23656) affects Windows App Client for Windows Desktop version 1.00 and is classified under CWE-345 (Insufficient Verification of Data Authenticity). The flaw allows an attacker to spoof data over a network due to inadequate verification mechanisms in the Windows App Installer. The CVSS 3.1 base score is 5.9 (medium severity), with network attack vector, high attack complexity, no privileges or user interaction required, and impact limited to integrity. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
An attacker exploiting this vulnerability could spoof data sent to the Windows App Installer, potentially causing the system to accept malicious or unauthorized data. The impact affects data integrity but does not compromise confidentiality or availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656) to remediate this vulnerability.
CVE-2026-23656: CWE-345: Insufficient Verification of Data Authenticity in Microsoft Windows App Client for Windows Desktop
Description
Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
CVSS v3.1
Score 5.9medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-23656) affects Windows App Client for Windows Desktop version 1.00 and is classified under CWE-345 (Insufficient Verification of Data Authenticity). The flaw allows an attacker to spoof data over a network due to inadequate verification mechanisms in the Windows App Installer. The CVSS 3.1 base score is 5.9 (medium severity), with network attack vector, high attack complexity, no privileges or user interaction required, and impact limited to integrity. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
An attacker exploiting this vulnerability could spoof data sent to the Windows App Installer, potentially causing the system to accept malicious or unauthorized data. The impact affects data integrity but does not compromise confidentiality or availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656) to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-01-14T16:59:33.462Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656","vendor":"Microsoft"}]
Threat ID: 69b05626ea502d3aa87d687f
Added to database: 03/10/2026, 17:34:30 UTC
Last enriched: 06/19/2026, 20:24:20 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 284
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