CVE-2025-26633: Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability

Q: How do I fix CVE-2025-26633?

windows 10 1507: upgrade to 10.0.10240.20947; windows 10 1607: upgrade to 10.0.14393.7876; windows 10 1809: upgrade to 10.0.17763.7009. Exact commands for each OS are on this page.

Q: Is CVE-2025-26633 being exploited?

Yes. CVE-2025-26633 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2025-26633 affect?

CVE-2025-26633 affects windows 10 1507, windows 10 1607, windows 10 1809. Severity is high (CVSS 7.0). Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature locally.

Q: How urgent is CVE-2025-26633?

Priority 89/100. High severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; On your watchlist

Patch now

HIGH 7.0EXPLOITEDWATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2025-26633 is a high-severity flaw (CVSS 7.0) affecting windows 10 1507, windows 10 1607, windows 10 1809, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature locally.

Why this priority

High severity
EPSS top 2%: 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	7.0 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	30.4% (top 2%)
CISA exploited list	Yes, fix due 2025-04-01, used in ransomware
Weakness	CWE-707
Published	2025-03-11
Last modified	2026-09-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-11Exploited Added to the CISA Known Exploited Vulnerabilities list
2025-03-11 17:16 UTCPublished CVE record published
2025-04-01Deadline CISA due date for US federal agencies to patch
2026-09-24 13:10 UTCUpdated Record last modified

microsoft windows 10 1507 UPGRADE

Affected: < 10.0.10240.20947

Fixed in: 10.0.10240.20947

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows 10 1607 UPGRADE

Affected: < 10.0.14393.7876

Fixed in: 10.0.14393.7876

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows 10 1809 UPGRADE

Affected: < 10.0.17763.7009

Fixed in: 10.0.17763.7009

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows 10 21h2 UPGRADE

Affected: < 10.0.19044.5608

Fixed in: 10.0.19044.5608

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows 10 22h2 UPGRADE

Affected: < 10.0.19045.5608

Fixed in: 10.0.19045.5608

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows 11 22h2 UPGRADE

Affected: < 10.0.22621.5039

Fixed in: 10.0.22621.5039

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · perl-WWW-OrangeHRM-Client · FIXED · 0.12.0-21.fc46 · FEDORA-2026-2d14efca09 · source

sudo dnf upgrade --advisory=FEDORA-2026-2d14efca09

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: mbanyamer/MSC-EvilTwin-Local-Privilege-Escalation (4 stars)
GitHub PoC: sandsoncosta/CVE-2025-26633 (2 stars)
Write-up: www.vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-managem
Write-up: www.vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-managem
Exploit-DB: Microsoft MMC MSC EvilTwin - Local Admin Creation

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-2025-26633?

windows 10 1507: upgrade to 10.0.10240.20947; windows 10 1607: upgrade to 10.0.14393.7876; windows 10 1809: upgrade to 10.0.17763.7009. Exact commands for each OS are on this page.

Is CVE-2025-26633 being exploited?

Yes. CVE-2025-26633 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2025-26633 affect?

CVE-2025-26633 affects windows 10 1507, windows 10 1607, windows 10 1809. Severity is high (CVSS 7.0). Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature locally.

How urgent is CVE-2025-26633?

Priority 89/100. High severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; On your watchlist

Software pages

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References

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