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Known exploited vulnerability

CVE-2026-124194

mediumCVSS 3.1 6.5In CISA KEVPublished · Microsoft

The short answer

CVE-2026-124194 affects Microsoft Microsoft 365 Apps for Enterprise and is rated medium (CVSS 6.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-10: attackers are using it, so patch it first.

What it is

Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Weakness: CWE-356.

Severity

6.5 medium

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

Exploited (CISA KEV)

Yes, since Nov 10, 2026

Federal due date Nov 24, 2026

EPSS, next 30 days

No score

FIRST scores CVEs within a day of publication

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

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…

Affected products

Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office LTSC 2024. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-124194 being exploited?

Yes. CISA added CVE-2026-124194 to its Known Exploited Vulnerabilities catalog on 2026-11-10, with a federal remediation due date of 2026-11-24.

How do I fix CVE-2026-124194?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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