Microsoft Office
CVE-2018-0850 — Microsoft Outlook Elevation of Privilege Vulnerability
Executive Summary
An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). To exploit the vulnerability, the attacker could send a specially crafted email to a victim. Outlook would then attempt to open a pre-configured message store contained in the email upon receipt of the email. This update addresses the vulnerability by ensuring Office fully validates incoming email formatting before processing message content.
Overview
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
EPSS Score
0.05032
probability of exploitation in the next 30 days
0.91514 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
10 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Office 2016 Click-to-Run (C2R) for 32-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office 2016 Click-to-Run (C2R) for 64-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Outlook 2007 Service Pack 3 | 4011200 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2010 Service Pack 2 (32-bit editions) | 4011711 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2010 Service Pack 2 (64-bit editions) | 4011711 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2013 RT Service Pack 1 | 4011697 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2013 Service Pack 1 (32-bit editions) | 4011697 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2013 Service Pack 1 (64-bit editions) | 4011697 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2016 (32-bit edition) | 4011682 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Outlook 2016 (64-bit edition) | 4011682 (Security Update) |
Important | Elevation of Privilege | Maybe |
Patches
5 patches
| Article | Type | Restart |
|---|---|---|
Click to Run |
Security Update | No |
4011200 |
Security Update | Maybe |
4011711 |
Security Update | Maybe |
4011697 |
Security Update | Maybe |
4011682 |
Security Update | Maybe |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
Nicolas Joly of Microsoft Corporation
References
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