CVE-2026-23656
published 2026-03-10CVE-2026-23656: Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
PriorityP433medium5.9CVSS 3.1
AVNACHPRNUINSUCNIHAN
EPSS
0.30%
21.5th percentile
Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_app | < 2.0.964.0 | 2.0.964.0 |
| microsoft | windows_app_client_for_windows_desktop | >= 1.00 < 2.0.964 | 2.0.964 |
| msrc | windows_app_client_for_windows_desktop | — | — |
CVSS provenance
nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
vendor_msrc5.9MEDIUM
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VulDB
Microsoft Windows App Client for Windows Desktop Installer data authenticity (WID-SEC-2026-0661)
vuldb·2026-07-06·CVSS 5.9
CVE-2026-23656 [MEDIUM] Microsoft Windows App Client for Windows Desktop Installer data authenticity (WID-SEC-2026-0661)
A vulnerability was found in Microsoft Windows App Client for Windows Desktop. It has been rated as problematic. This vulnerability affects unknown code of the component Installer. The manipulation leads to insufficient verification of data authenticity.
This vulnerability is traded as CVE-2026-23656. It is possible to initiate the attack remotely. There is no exploit available.
To fix this issue, it is recommended to deploy a patch.
GHSA
GHSA-53j2-qxv2-hfqj: Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network
ghsa_unreviewed·2026-03-10
CVE-2026-23656 [MEDIUM] CWE-345 GHSA-53j2-qxv2-hfqj: Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network
Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
Microsoft
Windows App Installer Spoofing Vulnerability
vendor_msrc·2026-03-10·CVSS 5.9
CVE-2026-23656 [MEDIUM] CWE-345 Windows App Installer Spoofing Vulnerability
Windows App Installer Spoofing Vulnerability
Description: Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.
FAQ: According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Exploitation requires the attacker to first gain the ability to intercept or influence update‑related network communications. This depends on environment‑specific conditions and preparatory actions that are outside the attacker’s direct control, making the exploit difficult to perform reliably.
Windows App Installer: Windows App Installer
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Spoofing
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Re
No detection rules found.
No public exploits indexed.
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos·2026-03-13
March Patch Tuesday visits 15 product families
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Bleepingcomputer
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
blogs_bleepingcomputer·2026-03-10·CVSS 8.8
[HIGH] Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Lawrence Abrams
The number of bugs in each vulnerability category is listed below:
46 Elevation of Privilege Vulnerabilities
2 Security Feature Bypass Vulnerabilities
18 Remote Code Execution Vulnerabilities
10 Information Disclosure Vulnerabilities
4 Denial of Service Vulnerabilities
4 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include 9 Microsoft Edge flaws, Mariner, Payment Orchestrator Service, Azure, and Microsoft Devices Pricing Program flaws fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos
March Patch Tuesday visits 15 product families
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Microsoft on Tuesday released 84 patches affecting 15 product families – including a few you’ve possibly never encountered. Eight of the addressed issues are considered by Microsoft to be of Critical severity, though none of those affect Windows, nor are they expected to be exploited within the next 30 days. In addition, five of those Critical issues were in fact addressed by Microsoft in advance of Patch Tuesday itself, as we’ll discuss below. Twenty-two have a CVSS base score of 8.0 or higher, including one with a 9.8 base score. None are known to be under active exploit in the wild, but two are publicly disclosed so far.
At patch time, six CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation. Various of this month’s issues are amenable
2026-03-10
Published