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CVE-2026-23656

Windows App Installer Spoofing Vulnerability

MEDIUM
5.9
CVSS Score
Published: March 10, 2026 at 05:05 PM UTC
Updated: June 17, 2026 at 10:21 AM UTC
1 product affected across 1 vendorWindows App

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows App· Microsoft
95%
v < 2.0.964.01.00 ≤ v < 2.0.9641.00
Affected range stops below 2.0.964, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-345

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