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Microsoft Office Outlook Remote Code Execution Vulnerability

CVE-2026-97749 is a remote code execution vulnerability in Microsoft Office Outlook (rated Critical, CVSS 9.8).

1 version

Facts

Microsoft id
CVE-2026-97749
Products
Microsoft Office Outlook
Severity
Critical
Impact
Remote Code Execution
CVSS
9.8
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-Oct
Assigned by
Microsoft
Weakness
CWE-415: Double Free
MSRC revision
1.1
Status pages
Outlook status
First captured by us
(from our first import of this list)
Microsoft last modified
Source
Security updates · open the original at Microsoft

Microsoft's revision notes

  1. Revision 1.0, 2026-10-13: Information published.
  2. Revision 1.1, 2026-11-10: Updated an acknowledgement. This is an informational change only.

Microsoft says

Double free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. How could an attacker exploit this vulnerability?

Security updates,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    The text as we first saw it

    Seen by us · Microsoft's timestamp · Microsoft's page

Other changes for Outlook