CVE-2026-96951
HighExploitedPublic exploitImproper 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.
Published Oct 13, 2026 · Updated Oct 16, 2026 · Also known as EUVD-2026-100274, GHSA-hjr5-mppg-mjq7
Key Facts
Patch immediately- CVE-2026-96951 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Outlook.com (Microsoft), Outlook Web (Microsoft), Outlook (Microsoft) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 13, 2026. Public exploit code is available.
- EPSS estimates a 1.5% probability of exploitation in the next 30 days.
- Fixed versions are available, including Outlook 20260925.100, windows 10 21H2 10.0.19044.7807, windows 10 22H2 10.0.19045.7807.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EPSS (30-day exploit likelihood)
1.5%
Higher than 74.0% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-96951 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 13, 2026 | Oct 16, 2026 | Not reported |
| Industry KEV feed | Oct 13, 2026 | Oct 16, 2026 | Not reported |
| CIRCL KEV | Oct 13, 2026 | Oct 16, 2026 | Not reported |
| ENISA EUVD | Oct 13, 2026 | n/a | Not reported |
Required action: 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.
Affected Products
85 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Outlook.comMicrosoft | >= 1.0.0 | 20260925.100 |
| Outlook WebMicrosoft | See advisory | n/a |
| OutlookMicrosoft | See advisory | 20260925.100 |
| Windows 11 Version 26h2 For Arm64-Based SystemsMicrosoft | See advisory | 10.0.26300.9711 |
| Windows 11 Version 26h2 For X64-Based SystemsMicrosoft | See advisory | n/a |
Patched Releases
Outlook
20260925.100
windows 10 21H2
10.0.19044.7807
windows 10 22H2
10.0.19045.7807
windows 11 23H2
10.0.22631.7652
windows 11 24H2
10.0.26100.9711
windows 11 25H2
10.0.26200.9711
windows 11 26H1
10.0.28000.3231
Windows 11 26h2
10.0.26300.9711
windows server 2012 R2
6.3.9600.23470
Windows Server 2025
10.0.26100.33650
Outlook.com
20260925.100
Windows 10 Version 1607
10.0.14393.9612
Windows 10 Version 1607 for 32-bit Systems
10.0.14393.9612
Windows 10 Version 1607 for x64-based Systems
10.0.14393.9612
Windows 10 Version 1809
10.0.17763.9376
Windows 10 Version 1809 for 32-bit Systems
10.0.17763.9376
Windows 10 Version 1809 for x64-based Systems
10.0.17763.9376
Windows 10 Version 21H2
10.0.19044.7807
Windows 10 Version 21H2 for 32-bit Systems
10.0.19044.7807
Windows 10 Version 22H2
10.0.19044.7807, 10.0.19045.7807
Windows 10 Version 22H2 for 32-bit Systems
10.0.19044.7807, 10.0.19045.7807
Windows 11 Version 23H2
10.0.22631.7652
Windows 11 Version 23H2 for ARM64-based Systems
10.0.22631.7652
Windows 11 Version 23H2 for x64-based Systems
10.0.22631.7652
Windows 11 Version 24H2
10.0.26100.9711
Timeline
Publicly disclosed
Oct 13, 2026
Added to CISA KEV
Oct 13, 2026
Added to Industry KEV feed
Oct 13, 2026
Added to CIRCL KEV
Oct 13, 2026
Added to ENISA EUVD
Oct 13, 2026
Last updated
Oct 16, 2026
Weakness Type
- CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
References
FAQ
Common Questions.
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.
Affected: Outlook.com (Microsoft) versions >= 1.0.0; Outlook Web (Microsoft); Outlook (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 13, 2026.
Yes. It was added on Oct 13, 2026 with a federal remediation due date of Oct 16, 2026.
Public exploit code is available.
Fixed versions are available, including Outlook 20260925.100, windows 10 21H2 10.0.19044.7807, windows 10 22H2 10.0.19045.7807.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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