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ExploitedIn CISA KEV

CVE-2026-124194

Microsoft Outlook Spoofing Vulnerability

Exploitation confirmed. First attested on 2026-11-10 by CISA-ADP, CISA KEV.

  • Published2026-11-10
  • WeaknessCWE-356

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2026-11-10Listed as exploited by GCVEGCVE
  2. 2026-11-10Reported as exploited by ENISA (EUVD)ENISA EUVD
  3. 2026-11-10Exploitation first reportedENISA EUVD
  4. 2026-11-10Added to the CISA KEV catalogCISA KEV
  5. 2026-11-1018:22CVE publishedCNA
  6. 2026-11-1019:20CVE publishedNVD
  7. 2026-11-1019:50SSVC exploitation set to activeCISA-ADP

Versions per branch

NVD
Microsoft 365 apps
BranchAffectedFixed in
—all versionsno fix published
Microsoft office 2021
BranchAffectedFixed in
—all versionsno fix published
Microsoft office 2024
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft 365 Apps for Enterprise

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.1, < https://aka.ms/OfficeSecurityReleasesfixed in https://aka.ms/OfficeSecurityReleasescustom
  • Microsoft Office LTSC 2021

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.1, < 16.0.14334.21048fixed in 16.0.14334.21048custom
  • Microsoft Office LTSC 2024

    platforms: 32-bit Systems, x64-based Systems

    Affected
    • ≥ 16.0.0, < 16.0.17932.21140fixed in 16.0.17932.21140custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-10

Fix

  1. 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-11-24

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2026-11-10
Patch Due Date
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.

Sources

  • CISA KEVKEV entry2026-11-10
  • ENISA EUVDexploitation2026-11-102026-11-10
  • GCVEexploitation2026-11-10
  • CISA-ADPSSVC decisionactive2026-11-10
  • CNACVSS 3.16.52026-11-10
  • NVDCVSS 3.16.5read 2026-11-10
  • CNAweakness (CWE)CWE-3562026-11-10
  • NVDweakness (CWE)CWE-356read 2026-11-10

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Published
2026-11-10
Last Modified
2026-11-10
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-124194?

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

Is CVE-2026-124194 actively exploited?

Yes. CVE-2026-124194 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-11-24.

What is the CVSS score for CVE-2026-124194?

CVE-2026-124194 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

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