CVE-2026-96951: Microsoft outlook web command injection vulnerability

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.

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

Exploitation in the wild

CISA added CVE-2026-96951 to the Known Exploited Vulnerabilities catalog on 13 October 2026 as "Microsoft Windows Command Injection Vulnerability". 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. Federal deadline 16 October 2026.

Affected products

15 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Outlook Web Microsoft Windows 10 1607 Microsoft Windows 10 1809 Microsoft Windows 10 21h2 Microsoft Windows 10 22h2 Microsoft Windows 11 23h2 Microsoft Windows 11 24h2 Microsoft Windows 11 25h2 Microsoft Windows 11 26h1 Microsoft Windows 11 26h2 Microsoft Windows Server 2012 Microsoft Windows Server 2016 Microsoft Windows Server 2019 Microsoft Windows Server 2022 Microsoft Windows Server 2025 Microsoft

References

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.