# CVE-2018-8244: Microsoft Outlook Elevation of Privilege Vulnerability

CVE-2018-8244 is fixed in 7 products on 1 platform, first by KB4022205, released June 12, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-8244
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0580
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jun 12, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8244

## Description

<p>An elevation of privilege vulnerability exists when Microsoft Outlook does not validate attachment headers properly. An attacker who successfully exploited the vulnerability could send an email with hidden attachments that would be opened or executed once a victim clicks a link within the email. Note that this does not bypass attachment filters, so blocked attachments will still be excluded.</p> <p>To exploit the vulnerability, the attacker could send a specially crafted email to a victim. The victim would then be required to click on a link within the email to open or execute a malicious attachment.</p> <p>This update addresses the vulnerability by changing the way that Outlook parses attachment headers.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (32-bit editions) |  | [KB4022205](https://patchblox.com/security/data/fix/microsoft/kb4022205.md) | Jun 12, 2018 |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 (64-bit editions) |  | [KB4022205](https://patchblox.com/security/data/fix/microsoft/kb4022205.md) | Jun 12, 2018 |
| Microsoft | Microsoft Outlook 2013 RT Service Pack 1 |  | [KB4022169](https://patchblox.com/security/data/fix/microsoft/kb4022169.md) | Jun 12, 2018 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (32-bit editions) |  | [KB4022169](https://patchblox.com/security/data/fix/microsoft/kb4022169.md) | Jun 12, 2018 |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 (64-bit editions) |  | [KB4022169](https://patchblox.com/security/data/fix/microsoft/kb4022169.md) | Jun 12, 2018 |
| Microsoft | Microsoft Outlook 2016 (32-bit edition) |  | [KB4022160](https://patchblox.com/security/data/fix/microsoft/kb4022160.md) | Jun 12, 2018 |
| Microsoft | Microsoft Outlook 2016 (64-bit edition) |  | [KB4022160](https://patchblox.com/security/data/fix/microsoft/kb4022160.md) | Jun 12, 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