Technology · Microsoft
Microsoft Outlook vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 11 vulnerabilities in Microsoft Outlook: 4 in the last 7 days and 7 in the last 90 days, 4 of them critical and 3 exploited in the wild. The most recent, CVE-2026-124194, was published on 10 November 2026. Nothing in the last four weeks, down from 1 vulnerability in the four before.
- Last 7 days
- 4
- Last 90 days
- 7
- Critical, all time
- 4
- Exploited in the wild
- 3
About Microsoft Outlook
Email and calendar client application by Microsoft for managing messages and scheduling.
Latest Microsoft Outlook vulnerabilities
- CVE-2026-124194: Microsoft Office Outlook user warning spoofing vulnerabilitycriticalexploited in the wildCVSS 6.5
- CVE-2026-123384: Microsoft Outlook heap-based buffer overflowhighCVSS 8.8
- CVE-2026-123380: Microsoft Outlook heap-based buffer overflowhighCVSS 8.8
- CVE-2026-123377: Microsoft Office Outlook heap-based buffer overflowhighCVSS 8.8
- CVE-2026-70125: Microsoft Office Outlook remote code executionhighCVSS 8.8EPSS 0.4%
- CVE-2026-80084: Microsoft Outlook out-of-bounds read information disclosuremediumCVSS 6.5EPSS 0.9%
- CVE-2026-78509: Microsoft Outlook heap buffer overflow allows remote code executioncriticalCVSS 9.8EPSS 1.0%
- CVE-2026-42893: Microsoft M365 Copilot command injectionhighCVSS 7.4
- CVE-2024-21413: Microsoft Outlook Improper Input Validation Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2023-35311: Microsoft Outlook Security Feature Bypass Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-1999-0519: Microsoft NetBIOS and SMB null or default password on network shareshighCVSS 7.5
Most severe Microsoft Outlook vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2024-21413: Microsoft Outlook Improper Input Validation Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2023-35311: Microsoft Outlook Security Feature Bypass Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2026-124194: Microsoft Office Outlook user warning spoofing vulnerabilitycriticalexploited in the wildCVSS 6.5
- CVE-2026-78509: Microsoft Outlook heap buffer overflow allows remote code executioncriticalCVSS 9.8EPSS 1.0%
- CVE-2026-70125: Microsoft Office Outlook remote code executionhighCVSS 8.8EPSS 0.4%
- CVE-2026-123384: Microsoft Outlook heap-based buffer overflowhighCVSS 8.8
- CVE-2026-123380: Microsoft Outlook heap-based buffer overflowhighCVSS 8.8
- CVE-2026-123377: Microsoft Office Outlook heap-based buffer overflowhighCVSS 8.8
- CVE-1999-0519: Microsoft NetBIOS and SMB null or default password on network shareshighCVSS 7.5
- CVE-2026-42893: Microsoft M365 Copilot command injectionhighCVSS 7.4
Vulnerabilities per week
Nothing in the last four weeks, down from 1 vulnerability in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 2 | 1 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 1 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 4 | 1 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Microsoft Outlook vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/outlook)<a href="https://junglewise.ai/threats/technologies/outlook"><img src="https://junglewise.ai/threats/technologies/outlook/badge.svg" alt="Microsoft Outlook vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/outlook.json, and this page as text at https://junglewise.ai/threats/technologies/outlook.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Microsoft Outlook vulnerabilities", https://junglewise.ai/threats/technologies/outlook, 11 November 2026.