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Microsoft

Microsoft Defender Insufficient Granularity of Access Control Vulnerability

CVE-2026-33825

What this means

This is rated high severity (7.8 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Microsoft Defender Antimalware Platform is in your estate, and treat that as the priority.

Full vendor description

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

Scoring and exploitation

7.8/ 10
CVSS 3.1 base scoreHigh

Exploitable only with local access and a low-privilege account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability

Longer bar: easier to attack

Attack vectorLocalAV:L
Attack complexityLowAC:L
Privileges requiredLowPR:L
User interactionNoneUI:N
ScopeUnchangedS:U

Impact

Longer bar: more harm

ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
~6.7% estimated chance of attack in 30 daysModel estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Known
Listed product
Microsoft Defender

Weaknesses

CWE-1220

Affected products ()

  • Microsoft Defender Antimalware Platform
Show the raw CPE strings (1)
  • cpe:2.3:a:microsoft:defender_antimalware_platform:*:*:*:*:*:*:*:*

References

3 links from the CVE record, grouped by site; the vendor's advisory comes first.

Related feed events

  • Microsoft Defender Insufficient Granularity of Access Control Vulnerability

    Type Vulnerability

    Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorised attacker to escalate privileges locally. Known-exploited catalogue reports exploitation in the wild.

    Next step: Confirm whether Microsoft Windows Server is in your estate.

    Who's reporting

    1 of 3 perspectives

    Official authority: Official 1Vendor statement missing. no VendorResearcher coverage missing. no Researcher1 signal

    Only official coverage so far. Treat as an early signal.

    Microsoft Windows Server
    CVE-2026-33825