CVE-2026-80073ImportantRevised 24 Sep
Microsoft Office Outlook Information Disclosure Vulnerability
Assessment
Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose information over a network.
- Severity
- Important
- CVSS base score
- 6.5CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:R/ S:U/ C:H/ I:N/ A:N/ E:U/ RL:O/ RC:C - Impact
- Information Disclosure
- EPSS, next 30 days
- 0.9%Higher than 58.8% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation Less Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Office Outlook
- Weakness
- CWE-125: Out-of-bounds Read
- Issued by
- Microsoft
- Published
- 8 Sep 2026 · September 2026
- Last revised
- 24 Sep 2026Updated an acknowledgement. This is an informational change only.
Updates that fix it
1 KB| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5002919 | Security Update | — | Microsoft Outlook 2016 (32-bit edition), Microsoft Outlook 2016 (64-bit edition) | All CVEs in KB5002919 |
Affected products
Microsoft Office10 affected products
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft Office 2019 for 32-bit editions
- Microsoft Office 2019 for 64-bit editions
- Microsoft Office LTSC 2021 for 32-bit editions
- Microsoft Office LTSC 2021 for 64-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft Office LTSC 2024 for 64-bit editions
- Microsoft Outlook 2016 (32-bit edition)
- Microsoft Outlook 2016 (64-bit edition)