CVE-2026-50656: Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defend

This week

HIGH 7.8WATCHLISTMITIGATE

CVE-2026-50656 is a high-severity flaw (CVSS 7.8) affecting malware protection engine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as "RoguePlanet ".

Why this priority

High severity
EPSS top 4%: very likely to be exploited
CISA SSVC: public proof of concept
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	11.2% (top 4%)
CISA exploited list	No
Weakness	CWE-59
Published	2026-06-16
Last modified	2026-10-25

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-16 19:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

microsoft malware protection engine MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy malware-protection-engine || rpm -q malware-protection-engine || malware-protection-engine --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

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: 0xBlackash/CVE-2026-50656 (10 stars)
GitHub PoC: g0thamRabb1t/CVE-2026-50656-rogueplanet-validation (2 stars)
GitHub PoC: eh-amish/Windows-Defender-Security-Auditor-CVE-2026-50656- (1 stars)
Write-up: github.com/MSNightmare/RoguePlanet
Write-up: github.com/MSNightmare/ShieldBreak

Verify at the official source NVD · CVE Program · 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-2026-50656?

malware protection engine: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-50656 being exploited?

CVE-2026-50656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-50656 affect?

CVE-2026-50656 affects malware protection engine. Severity is high (CVSS 7.8). Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as "RoguePlanet ".

How urgent is CVE-2026-50656?

Priority 59/100. High severity; EPSS top 4%: very likely to be exploited; CISA SSVC: public proof of concept; On your watchlist

Software pages

Windows Defender vulnerabilities

Related CVEs

CVE-2026-55011 HIGH 7.8 UPGRADE Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code l
CVE-2026-55012 HIGH 7.8 UPGRADE Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.

References

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