Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-123379 is a remote code execution vulnerability in Microsoft Office Outlook (rated Important, CVSS 7.5).
1 version
Facts
- Microsoft id
CVE-2026-123379- Products
- Microsoft Office Outlook
- Severity
- Important
- Impact
- Remote Code Execution
- CVSS
- 7.5
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
- Customer action required
- Yes
- Release
- 2026-Nov
- Assigned by
- Microsoft
- Weakness
- CWE-122: Heap-based Buffer Overflow
- MSRC revision
- 1.0
- Status pages
- Outlook status
- First captured by us
- Microsoft last modified
- Source
- Security updates · open the original at Microsoft
Microsoft's revision notes
- Revision 1.0, 2026-11-10:
Information published.
Microsoft says
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
What Microsoft changed
One version so far. If Microsoft edits it, each change shows here with what was removed and added.
First version we captured ·
The text as we first saw it
Seen by us · Microsoft's timestamp · Microsoft's page
Related changes
Mentioning the same Microsoft ids
Other changes for Outlook
- Microsoft Office Outlook Remote Code Execution Vulnerability
- Microsoft Office Outlook Information Disclosure Vulnerability
- Microsoft Office Outlook Remote Code Execution Vulnerability
- Microsoft Office Outlook Remote Code Execution Vulnerability
- Microsoft Office Outlook Remote Code Execution Vulnerability
- Microsoft Outlook Spoofing Vulnerability · Exploited
- Microsoft Office Outlook Remote Code Execution Vulnerability
- Microsoft Office Outlook Remote Code Execution Vulnerability
Last updated