Spoofing Vulnerability in Microsoft Office Outlook
CVE-2026-124194

6.5MEDIUM

Key Information:

Vendor: Microsoft
Status: Microsoft 365 Apps For Enterprise; Microsoft Office Ltsc 2021; Microsoft Office Ltsc 2024
Vendor: CVE Published:; 10 November 2026

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What is CVE-2026-124194?

CVE-2026-124194 is a vulnerability identified in Microsoft Office Outlook, a widely-used email and calendaring client that facilitates communication and scheduling for individuals and organizations. This vulnerability arises from the software's failure to adequately warn users about unsafe actions, which could enable unauthorized attackers to perform spoofing attacks over a network. The lack of proper notifications may lead users to inadvertently engage with potentially malicious content or links, thereby compromising the integrity and confidentiality of their communications. As Microsoft Outlook is integral to many business operations, the exploitation of this vulnerability can have significant adverse effects on organizational security and user trust.

Potential impact of CVE-2026-124194

Data Breaches: The vulnerability enables spoofing attacks, which can result in unauthorized access to sensitive information. Attackers may impersonate trusted contacts to extract confidential data, leading to potential data breaches.
Reputational Damage: Organizations affected by the exploitation of this vulnerability could suffer reputational harm if sensitive communications are intercepted or misrepresented. This could lead to a loss of client trust and affect business relationships.
Increased Phishing Risks: The absence of user warnings can facilitate phishing attempts, putting users at greater risk of falling victim to such tactics. This can result in financial losses and further compromise systems if users unknowingly provide their credentials or download malicious content.

CISA has reported CVE-2026-124194

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-124194 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: 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.