---
id: "CVE-2025-26633"
kind: "vulnerability"
aliases: ["CVE-2025-26633"]
title: "Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature\u2026"
severity: "high"
cvss: 7.0
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1507", "fixed": ["10.0.10240.20947"], "affected": "< 10.0.10240.20947", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1607", "fixed": ["10.0.14393.7876"], "affected": "< 10.0.14393.7876", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1809", "fixed": ["10.0.17763.7009"], "affected": "< 10.0.17763.7009", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h2", "fixed": ["10.0.19044.5608"], "affected": "< 10.0.19044.5608", "ecosystem": "vendor"}, {"name": "microsoft windows 10 22h2", "fixed": ["10.0.19045.5608"], "affected": "< 10.0.19045.5608", "ecosystem": "vendor"}, {"name": "microsoft windows 11 22h2", "fixed": ["10.0.22621.5039"], "affected": "< 10.0.22621.5039", "ecosystem": "vendor"}, {"name": "microsoft windows 11 23h2", "fixed": ["10.0.22631.5039"], "affected": "< 10.0.22631.5039", "ecosystem": "vendor"}, {"name": "microsoft windows 11 24h2", "fixed": ["10.0.26100.3403"], "affected": "< 10.0.26100.3403", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "= r2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2012", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2012", "fixed": [], "affected": "= r2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2016", "fixed": ["10.0.14393.7876"], "affected": "< 10.0.14393.7876", "ecosystem": "vendor"}, {"name": "microsoft windows server 2019", "fixed": ["10.0.17763.7009"], "affected": "< 10.0.17763.7009", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022", "fixed": ["10.0.20348.3270"], "affected": "< 10.0.20348.3270", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022 23h2", "fixed": ["10.0.25398.1486"], "affected": "< 10.0.25398.1486", "ecosystem": "vendor"}, {"name": "microsoft windows server 2025", "fixed": ["10.0.26100.3403"], "affected": "< 10.0.26100.3403", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "microsoft-mmc", "ransomware", "windows"]
not_affected_if: ["unpatched-builds-only"]
published_at: "2025-03-11T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-26633", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26633", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature…

Microsoft Windows Management Console (MMC) fails to properly neutralize input, letting a local attacker bypass a Windows security feature. CISA lists it as actively exploited, with ransomware use noted in the catalog.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 10 1507 affected < 10.0.10240.20947 fixed 10.0.10240.20947
- vendor:microsoft windows 10 1607 affected < 10.0.14393.7876 fixed 10.0.14393.7876
- vendor:microsoft windows 10 1809 affected < 10.0.17763.7009 fixed 10.0.17763.7009
- vendor:microsoft windows 10 21h2 affected < 10.0.19044.5608 fixed 10.0.19044.5608
- vendor:microsoft windows 10 22h2 affected < 10.0.19045.5608 fixed 10.0.19045.5608
- vendor:microsoft windows 11 22h2 affected < 10.0.22621.5039 fixed 10.0.22621.5039
- vendor:microsoft windows 11 23h2 affected < 10.0.22631.5039 fixed 10.0.22631.5039
- vendor:microsoft windows 11 24h2 affected < 10.0.26100.3403 fixed 10.0.26100.3403
- vendor:microsoft windows server 2008 affected ? fixed ?
- vendor:microsoft windows server 2008 affected = r2 fixed ?
- vendor:microsoft windows server 2012 affected ? fixed ?
- vendor:microsoft windows server 2012 affected = r2 fixed ?
- vendor:microsoft windows server 2016 affected < 10.0.14393.7876 fixed 10.0.14393.7876
- vendor:microsoft windows server 2019 affected < 10.0.17763.7009 fixed 10.0.17763.7009
- vendor:microsoft windows server 2022 affected < 10.0.20348.3270 fixed 10.0.20348.3270
- vendor:microsoft windows server 2022 23h2 affected < 10.0.25398.1486 fixed 10.0.25398.1486
- vendor:microsoft windows server 2025 affected < 10.0.26100.3403 fixed 10.0.26100.3403

## Fix

Apply the Microsoft patch for CVE-2025-26633 via Windows Update; the sources do not name the fixed build.
Follow CISA's required action: apply vendor mitigations or discontinue use if mitigations are unavailable.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-26633
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-26633

## From the sources

Microsoft Windows Management Console (MMC) contains an improper neutralization vulnerability that allows an unauthorized attacker to bypass a security feature locally.

CISA 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_