CVE-2026-33825: Microsoft Defender Insufficient Granularity of Access Control Vulnerability

Q: How do I fix CVE-2026-33825?

defender antimalware platform: upgrade to 4.18.26030.3011. Exact commands for each OS are on this page.

Q: Is CVE-2026-33825 being exploited?

Yes. CVE-2026-33825 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2026-33825 affect?

CVE-2026-33825 affects defender antimalware platform. Severity is high (CVSS 7.8). Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

Q: How urgent is CVE-2026-33825?

Priority 91/100. High severity; EPSS top 6%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; On your watchlist

Patch now

HIGH 7.8EXPLOITEDWATCHLISTUPGRADE

CVE-2026-33825 is a high-severity flaw (CVSS 7.8) affecting defender antimalware platform, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Exploited in the wild (CISA KEV)
Used in ransomware campaigns
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	6.7% (top 6%)
CISA exploited list	Yes, fix due 2026-05-06, used in ransomware
Weakness	CWE-1220
Published	2026-04-14
Last modified	2026-07-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 18:17 UTCPublished CVE record published
2026-04-22Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-05-06Deadline CISA due date for US federal agencies to patch
2026-07-24 22:10 UTCUpdated Record last modified

microsoft defender antimalware platform UPGRADE

Affected: < 4.18.26030.3011

Fixed in: 4.18.26030.3011

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy defender-antimalware-platform || rpm -q defender-antimalware-platform || defender-antimalware-platform --version

2. UPGRADE to 4.18.26030.3011 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade defender-antimalware-platform

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade defender-antimalware-platform

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · icecat · FIXED · 153.6.0-2.rh1.fc46 · FEDORA-2026-25e05b5320 · source

sudo dnf upgrade --advisory=FEDORA-2026-25e05b5320

Fedora ELN · edk2 · FIXED · 20260812-14.eln159 · FEDORA-2026-8850ef9153 · source

sudo dnf upgrade --advisory=FEDORA-2026-8850ef9153

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Letlaka/redsun-bluehammer-undefend-detection-pack (10 stars)
GitHub PoC: 0xBlackash/CVE-2026-33825 (9 stars)
GitHub PoC: Bilal3755/Detecting_blue_hammer_vuln (0 stars)
Write-up: www.huntress.com/blog/nightmare-eclipse-intrusion

Advisories and coverage

Research and news

Qualys Blog: The Science of Exploitability: Decoding BlueHammer 2026-10-21

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33825?

defender antimalware platform: upgrade to 4.18.26030.3011. Exact commands for each OS are on this page.

Is CVE-2026-33825 being exploited?

Yes. CVE-2026-33825 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-33825 affect?

CVE-2026-33825 affects defender antimalware platform. Severity is high (CVSS 7.8). Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

How urgent is CVE-2026-33825?

Priority 91/100. High severity; EPSS top 6%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; On your watchlist

Software pages

Windows Defender vulnerabilities

References

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