CVE-2026-78525 Microsoft Office Outlook - Remote Code Execution

Microsoft Office Outlook contains a use after free vulnerability that allows unauthorized attackers to execute code remotely over a network, exploit requires network access.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.82% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Update to the latest version of Microsoft Office Outlook.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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