Known exploited vulnerability
CVE-2026-33825
The short answer
CVE-2026-33825 affects Microsoft Microsoft Defender Antimalware Platform and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-04-22: attackers are using it, so patch it first.
What it is
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.
Weakness: CWE-1220.
Severity
7.8 high
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Apr 22, 2026
Federal due date May 6, 2026
EPSS, next 30 days
6.7%
Higher than 94% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Microsoft Defender Antimalware Platform. NVD's record lists the exact affected versions.
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825 Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33825 US Government Resource
- www.huntress.com/blog/nightmare-eclipse-intrusion Third Party Advisory
Questions
Is CVE-2026-33825 being exploited?
Yes. CISA added CVE-2026-33825 to its Known Exploited Vulnerabilities catalog on 2026-04-22, with a federal remediation due date of 2026-05-06. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2026-33825?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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