CVE-2026-124194 Microsoft Outlook Spoofing Vulnerability
MediumCVSS 6.5
CISA KEV
added 2026-11-10 · due 2026-11-24
Exploited in the wild
- Published
- Updated
- Exploit status
- Exploited in the wild (confirmed)
Description
Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
CISA Known Exploited Vulnerability
- Date added
- 2026-11-10
- Due date (FCEB)
- 2026-11-24
- Ransomware use
- Unknown
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
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft office 2021 | < 16.0.14334.21048 | 16.0.14334.21048 |
| Microsoft office 2024 | < 16.0.17932.21140 | 16.0.17932.21140 |
| Microsoft 365 apps | All versions | No fix listed |
| Microsoft 365 Apps for Enterprise | >= 16.0.1, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2021 | >= 16.0.1, < 16.0.14334.21048 | 16.0.14334.21048 |
| Microsoft Office LTSC 2024 | >= 16.0.0, < 16.0.17932.21140 | 16.0.17932.21140 |
References
- MSRC Security Update Guide patch vendor-advisory
- Release Notes vendor-advisory
- Release Notes vendor-advisory
- www.cisa.gov government-resource