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CVE-2026-96951

Windows Shell Security Feature Bypass Vulnerability

Exploited in the wild. In CISA KEV since 2026‑10‑13. Fixed versions are out.

CVSS 3.18.8HighEPSS percentile—No score yetCISA KEVListedsince 2026-10-13, due 2026-10-16
No public exploit knownFix5 products10 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Microsoft Outlook.comAffected: ≥ 1.0.0, < 20260925.100Upgrade to: 20260925.100Stated by: CVE record
  • Microsoft Windows 10 Version 1607Affected: ≥ 10.0.14393.0, < 10.0.14393.9612Upgrade to: 10.0.14393.9612Affected: ≥ 10.0.17763.0, < 10.0.17763.9376Upgrade to: 10.0.17763.9376Affected: ≥ 10.0.19044.0, < 10.0.19044.7807Upgrade to: 10.0.19044.7807Affected: ≥ 10.0.19045.0, < 10.0.19044.7807Upgrade to: 10.0.19044.7807Stated by: CVE record
  • Microsoft Windows 11 version 23H2Affected: ≥ 10.0.22631.0, < 10.0.22631.7652Upgrade to: 10.0.22631.7652Affected: ≥ 10.0.26100.0, < 10.0.26100.9711Upgrade to: 10.0.26100.9711Affected: ≥ 10.0.26200.0, < 10.0.26200.9711Upgrade to: 10.0.26200.9711Affected: ≥ 10.0.28000.0, < 10.0.28000.3231Upgrade to: 10.0.28000.3231Stated by: CVE record
  • Microsoft Windows 11 Version 26H2Affected: ≥ 10.0.26300.0, < 10.0.26300.9711Upgrade to: 10.0.26300.9711Stated by: CVE record
  • Microsoft Windows Server 2012 R2Affected: ≥ 6.3.9600.0, < 6.3.9600.23470Upgrade to: 6.3.9600.23470Stated by: CVE record

Versions as the sources state them. 4 more products have version data. Full version matrix after sign-in

Is your organisation exposed?Request an assessment to establish which checks fit your systems.

Coverage timeline

3 publishers

  1. Vendor patch released

    ·Krebs on Security

  2. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened. 3 further articles named this CVE in wider roundups without reporting it as a distinct event.

What it is

From the CVE record

Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

CISA KEV
CISA KEV

Listed as exploited in the wild since 2026-10-13.

US federal agencies must remediate by 2026-10-16.

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

No EPSS score yet. New CVEs are usually scored within a few days.

Lifecycle

6 events over 0 days, from the signal feeds we watch.

  1. Added to CISA KEVpublished, weakness classified, att&ck mapped, record updated, record updated

Affected products

And 12 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Scored 8.8 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction RequiredA user must click a link, open a file, or perform some action

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

In the news

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Outlook.com, not every advisory. This one: actively exploited.