CVE-2026-124194365 Apps Vulnerability
Microsoft Outlook Spoofing Vulnerability
Published Nov 10, 2026 · Updated Nov 10, 2026
Key Facts
Patch immediately- CVE-2026-124194 is a medium-severity vulnerability (CVSS 6.5 v3.1) affecting 365 Apps (Microsoft), Office 2021 (Microsoft), Office 2024 (Microsoft) and 3 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed since Nov 10, 2026. No public exploit code is known.
- Fixed versions are available, including Office 2021 16.0.14334.21048, Office 2024 16.0.17932.21140, Microsoft Office LTSC 2021 16.0.14334.21048.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
EPSS (30-day exploit likelihood)
n/a
Exploit maturity
Exploited (KEV)
ATLAS score
47/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Nov 10, 2026
0 days after publication
Federal due date
Nov 24, 2026
14 days left
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Required action (CISA): 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.
Advisories And Exploit References
Description
Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 10, 2026 | Nov 24, 2026 | Not reported |
| Industry KEV feed | Nov 10, 2026 | Nov 24, 2026 | 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
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| 365 AppsMicrosoft | See advisory | n/a |
| Office 2021Microsoft | See advisory | 16.0.14334.21048 |
| Office 2024Microsoft | See advisory | 16.0.17932.21140 |
| Microsoft 365 Apps for Enterprise | See advisory | n/a |
| Microsoft Office LTSC 2021 | >= 16.0.1 | 16.0.14334.21048 |
Patched Releases
Office 2021
16.0.14334.21048
Office 2024
16.0.17932.21140
Microsoft Office LTSC 2021
16.0.14334.21048
Microsoft Office LTSC 2024
16.0.17932.21140
Timeline
Publicly disclosed
Nov 10, 2026
Added to CISA KEV
Nov 10, 2026
Added to Industry KEV feed
Nov 10, 2026
Weakness Type
- CWE-356 Missing User Interaction for Potentially Unsafe Action
References
FAQ
Common Questions.
Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Affected: 365 Apps (Microsoft); Office 2021 (Microsoft); Office 2024 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed since Nov 10, 2026.
Yes. It was added on Nov 10, 2026 with a federal remediation due date of Nov 24, 2026.
No public exploit code is known.
Fixed versions are available, including Office 2021 16.0.14334.21048, Office 2024 16.0.17932.21140, Microsoft Office LTSC 2021 16.0.14334.21048.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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