Microsoft Office
CVE-2018-8310 — Microsoft Office Tampering Vulnerability
Executive Summary
A tampering vulnerability exists when Microsoft Outlook does not properly handle specific attachment types when rendering HTML emails. An attacker could exploit the vulnerability by sending a specially crafted email and attachment to a victim, or by hosting a malicious .eml file on a web server. The attacker who successfully exploited the vulnerability could then embed untrusted TrueType fonts in the body of an email. This behavior could be combined with other exploits to further compromise a user's system. The security update addresses the vulnerability by correcting how Microsoft Outlook handles attachments.
Overview
Low
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
EPSS Score
0.05359
probability of exploitation in the next 30 days
0.91925 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
11 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Office 2010 Service Pack 2 (32-bit editions) | 4022200 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Office 2010 Service Pack 2 (64-bit editions) | 4022200 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Office 2016 Click-to-Run (C2R) for 32-bit editions | Click to Run (Security Update) |
Low | Tampering | No |
| Microsoft Office 2016 Click-to-Run (C2R) for 64-bit editions | Click to Run (Security Update) |
Low | Tampering | No |
| Microsoft Word 2010 Service Pack 2 (32-bit editions) | 4022202 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Word 2010 Service Pack 2 (64-bit editions) | 4022202 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Word 2013 RT Service Pack 1 | 4022224 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Word 2013 Service Pack 1 (32-bit editions) | 4022224 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Word 2013 Service Pack 1 (64-bit editions) | 4022224 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Word 2016 (32-bit edition) | 4022218 (Security Update) |
Low | Tampering | Maybe |
| Microsoft Word 2016 (64-bit edition) | 4022218 (Security Update) |
Low | Tampering | Maybe |
Patches
5 patches
| Article | Type | Restart |
|---|---|---|
4022200 |
Security Update | Maybe |
Click to Run |
Security Update | No |
4022202 |
Security Update | Maybe |
4022224 |
Security Update | Maybe |
4022218 |
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
Jonathan Birch of Microsoft Corporation
References
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