Microsoft Windows Shell's Protection Mechanism Failure Allows an Unauthorized Attacker to Perform Spoofing Over the Network; CISA's May 12th KEV Deadline Has Passed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-32202

Key Details

CVE	CVE-2026-32202
Vulnerability Name	Microsoft Windows Protection Mechanism Failure Vulnerability
Affected products	Microsoft Windows
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-693 (Protection Mechanism Failure)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-04-28.
Exploitation prediction (EPSS)	4.90% probability of exploitation in the next 30 days (92% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-05-12 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Microsoft	Windows

Vendor

Product

Affected Versions

Patch Status

Microsoft

Windows

Subsystems	EWS Workstation Delivery/Virtualization
Sectors	All Sectors

What to Know

Microsoft Windows Shell contains a protection mechanism failure vulnerability that allows an unauthorized attacker to perform spoofing over a network.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-32202
CVE	https://www.cve.org/CVERecord?id=CVE-2026-32202

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-32202

CVE

https://www.cve.org/CVERecord?id=CVE-2026-32202

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-04-28
Required Action Due Date	2026-05-12
Required Action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-04-28

Required Action Due Date

2026-05-12

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.