Technology · Microsoft
Microsoft Outlook vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 7 vulnerabilities in Microsoft Outlook: 1 in the last 7 days and 3 in the last 90 days, 3 of them critical and 2 exploited in the wild. The most recent, CVE-2026-70125, was published on 23 September 2026.
- Last 7 days
- 1
- Last 90 days
- 3
- Critical, all time
- 3
- Exploited in the wild
- 2
About Microsoft Outlook
A personal information manager and email client used for communication and scheduling.
Latest Microsoft Outlook vulnerabilities
- 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-2026-78509: 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-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
- CVE-2026-80084: Microsoft Outlook out-of-bounds read information disclosuremediumCVSS 6.5EPSS 0.9%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 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 |
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, 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, 26 September 2026.