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CVE-2026-33825

Microsoft Defender Insufficient Granularity of Access Control

7.8 HIGHActively exploited (CISA KEV)Used in ransomwareEPSS 0.40%
  1. Published14 Apr 2026
  2. Added to CISA KEV22 Apr 2026
  3. Remediation due6 May 2026
Actively exploited (CISA KEV)

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

Added to KEV: 22 Apr 2026Federal remediation due: 6 May 2026Used in ransomware

Description

Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Defender Antimalware Platform< 4.18.26030.3011

Remediation

Fixed in
Microsoft Defender Antimalware Platform≥ 4.18.26030.3011

References

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Frequently asked

Is CVE-2026-33825 being actively exploited?

Yes. CVE-2026-33825 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 22 Apr 2026. It has been used in ransomware campaigns.

How severe is CVE-2026-33825?

CVE-2026-33825 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-33825?

Affected products include Microsoft Defender Antimalware Platform.

How do I fix CVE-2026-33825?

Upgrade affected software to a fixed version, for example Microsoft Defender Antimalware Platform 4.18.26030.3011 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33825 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.