Microsoft Defender's Insufficient Access Control Allows an Authorized Attacker to Escalate Privileges Locally; CISA's May 6th KEV Deadline Has Passed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-33825

Key Details

CVE	CVE-2026-33825
Vulnerability Name	Microsoft Defender Insufficient Granularity of Access Control Vulnerability
Affected products	Microsoft Defender
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-1220 (Insufficient Granularity of Access Control)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-04-22.
Exploitation prediction (EPSS)	0.40% probability of exploitation in the next 30 days (32% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-05-06 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Microsoft	Defender

Vendor

Product

Affected Versions

Patch Status

Microsoft

Defender

Subsystems	EWS Engineering Software
Sectors	Multiple

What to Know

Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.

What to Do

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

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-33825
CVE	https://www.cve.org/CVERecord?id=CVE-2026-33825

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-33825

CVE

https://www.cve.org/CVERecord?id=CVE-2026-33825

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-04-22
Required Action Due Date	2026-05-06
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

2026-04-22

Required Action Due Date

2026-05-06

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.