---
title: "CVE-2025-26633: Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-26633/
description: "CVE-2025-26633 (Microsoft Windows): Exploited in the wild (CISA KEV). Improper neutralization in Microsoft Management Console allows an unauthorized…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-03-11
date_modified: 2026-08-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-26633"
kev: true
cvss: 7
epss: 0.30391
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Windows. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-03-11, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-04-01 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 30.4% , percentile 98: FIRST’s model estimates a 30.4% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.

## What it is

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

## Affected products (CVE record)

- Microsoft Windows 10 Version 1507: 10.0.10240.0 < 10.0.10240.20947
- Microsoft Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.7876
- Microsoft Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.7009
- Microsoft Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.5608
- Microsoft Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.5608
- Microsoft Windows 11 version 22H2: 10.0.22621.0 < 10.0.22621.5039
- Microsoft Windows 11 version 22H3: 10.0.22631.0 < 10.0.22631.5039
- Microsoft Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.5039
- Microsoft Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.3476
- Microsoft Windows Server 2008 R2 Service Pack 1: 6.1.7601.0 < 6.1.7601.27618

## Severity

- microsoft CVSS 3.1: 7 `CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C`

## Exploitation

- CISA KEV: added 2025-03-11; federal due date 2025-04-01. Known ransomware use: Known.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 30.39% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Microsoft Management Console Security Feature Bypass Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26633)
- [Listed in CISA KEV notes (msrc.microsoft.com)](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-26633)
- [CVE.org record CVE-2025-26633](https://www.cve.org/CVERecord?id=CVE-2025-26633)
- [NVD entry CVE-2025-26633](https://nvd.nist.gov/vuln/detail/CVE-2025-26633)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26633)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-management-console-detection-script)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-management-console-mitigation-script)

---
Source page: https://erroneo.us/security/cve/CVE-2025-26633/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt