Remote code execution via uninitialized resource use
Published Sep 8, 2026 · Updated Sep 9, 2026
Use of an uninitialized resource in Microsoft Office Outlook allows remote attackers to execute code through network-delivered content. Microsoft has not published the affected resource, processing locus, or operation that consumes it before initialization. Exploitation requires user interaction and runs attacker-controlled code with the privileges of the affected Outlook process.
Summary
What happened
Use of an uninitialized resource in Microsoft Office Outlook allows remote attackers to execute code through network-delivered content. Microsoft has not published the affected resource, processing locus, or operation that consumes it before initialization. Exploitation requires user interaction and runs attacker-controlled code with the privileges of the affected Outlook process.
The record
- CVE
- CVE-2026-78519
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-908, T1204
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=19.0.0 <16.0.10417.20207
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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