CVE-2026-78519

Microsoft Office Outlook Remote Code Execution Vulnerability

CVE-2026-78519 is fixed in 2 products on 1 platform, first by KB5002919, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

8.8

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0082

57th percentile

<p>Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Outlook 2016 (32-bit edition)	KB5002919	Sep 8, 2026
Microsoft Outlook 2016 (64-bit edition)	KB5002919	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Use of Uninitialized Resource
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78519

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