# CVE-2018-8310: Microsoft Office Tampering Vulnerability

CVE-2018-8310 is fixed in 9 products on 1 platform, first by KB4022200, released July 10, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-8310
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0588
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 10, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8310

## Description

<p>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.</p> <p>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.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Outlook handles attachments.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Office 2010 Service Pack 2 (32-bit editions) |  | [KB4022200](https://patchblox.com/security/data/fix/microsoft/kb4022200.md) | Jul 10, 2018 |
| Microsoft | Microsoft Office 2010 Service Pack 2 (64-bit editions) |  | [KB4022200](https://patchblox.com/security/data/fix/microsoft/kb4022200.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2010 Service Pack 2 (32-bit editions) |  | [KB4022202](https://patchblox.com/security/data/fix/microsoft/kb4022202.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2010 Service Pack 2 (64-bit editions) |  | [KB4022202](https://patchblox.com/security/data/fix/microsoft/kb4022202.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2013 RT Service Pack 1 |  | [KB4022224](https://patchblox.com/security/data/fix/microsoft/kb4022224.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2013 Service Pack 1 (32-bit editions) |  | [KB4022224](https://patchblox.com/security/data/fix/microsoft/kb4022224.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2013 Service Pack 1 (64-bit editions) |  | [KB4022224](https://patchblox.com/security/data/fix/microsoft/kb4022224.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2016 (32-bit edition) |  | [KB4022218](https://patchblox.com/security/data/fix/microsoft/kb4022218.md) | Jul 10, 2018 |
| Microsoft | Microsoft Word 2016 (64-bit edition) |  | [KB4022218](https://patchblox.com/security/data/fix/microsoft/kb4022218.md) | Jul 10, 2018 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo