Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2026-124194

Microsoft Outlook Spoofing Vulnerability

Microsoft 365 Apps for Enterprise · affected before https://aka.ms/OfficeSecurityReleases

Watch CVE-2026-124194 Browse KEV feed
Severity
CVSS 6.5 · Medium
Confidence
Confirmed
Exploit status
Trusted Third Party Report
EPSS
—
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-124194 is an unauthenticated Microsoft Outlook Spoofing Vulnerability.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Who is affected?

Affected products include Microsoft 365 Apps for Enterprise and 2 other products, including affected before https://aka.ms/OfficeSecurityReleases, affected before 16.0.14334.21048, and affected before 16.0.17932.21140.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Microsoft Outlook Spoofing Vulnerability

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

Microsoft Affected
Microsoft 365 Apps for Enterprise
Before https://aka.ms/OfficeSecurityReleases
Microsoft Affected
Microsoft Office LTSC 2021
Before 16.0.14334.21048
Microsoft Affected
Microsoft Office LTSC 2024
Before 16.0.17932.21140
View vendor advisory (opens in new tab)
Published
10 Nov 2026
Exploitation Attempts Reported
10 Nov 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
Required

Tags

microsoft cisa

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

Microsoft CVRF

Recorded 10 Nov 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
Microsoft CVRF First 2026-11-10 08:00 UTC
CISA 2026-11-10 19:20 UTC
CyberInsider 2026-11-10 23:21 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

6.5 Medium

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

—

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Product UI does not Warn User of Unsafe Actions CWE-356

Recent mention · CyberInsider

Microsoft’s November updates fix 1094 flaws, Outlook zero-day

Microsoft has released its November 2026 Patch Tuesday updates for Windows 11, fixing USB audio, printer installation, and Remote Desktop problems while strengthening NTLM authentication and PowerShell script verification. The broader Microsoft security release addresses 1,094...

Read full advisory

All Mentions

Recent mention · CyberInsider

Microsoft’s November updates fix 1094 flaws, Outlook zero-day

CyberInsider · 10 Nov 2026

Microsoft has released its November 2026 Patch Tuesday updates for Windows 11, fixing USB audio, printer installation, and Remote Desktop problems while strengthening NTLM authentication and PowerShell script verification. The broader Microsoft security release addresses 1,094 CVEs across its products, including 726 under Windows, and patches an actively exploited Outlook vulnerability that can expose users’ … The post Microsoft’s November updates fix 1094 flaws, Outlook zero-day appeared first on CyberInsider.

Recent mention · NCSC Security Advisories

NCSC-2026-0474 [1.00] [M/H] Kwetsbaarheden verholpen in Microsoft Office

NCSC Security Advisories · 10 Nov 2026

Microsoft heeft kwetsbaarheden verholpen in diverse Office producten. Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot de categorieën schade, zoals genoemd in onderstaande tabellen. Microsoft heeft voor Office meerdere kwetsbaarheden verholpen. De 2 ernstigste kwetsbaarheden bevinden zich in Sharepoint en hebben een CVSS score van 9.0 en 9.9 toegewezen gekregen. Voor succesvol misbruik van een aantal kwetsbaarheden moet de kwaadwillende het slachtoffer misleiden om een malafide bestand te openen of een malafide link te volgen. De...

Timeline

From disclosure to observed exploitation attempts

  1. 23:21 UTC

    KEV confirmed by CyberInsider

    Exploitation attempts reported by an external source

  2. 19:20 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 18:22 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 08:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  5. 22:09 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-124194

Sample API response 
{
  "cve_id": "CVE-2026-124194",
  "confidence": "Confirmed",
  "cvss_score": 6.5,
  "cvss_estimated": false,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}