# CVE-2018-8160: Microsoft Outlook Information Disclosure Vulnerability

CVE-2018-8160 is fixed in 5 products on 1 platform, first by KB4022137, released May 8, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-8160
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0846
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: May 8, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8160

## Description

<p>An information disclosure vulnerability exists in Outlook when a message is opened. This vulnerability could potentially result in the disclosure of sensitive information to a malicious site.</p> <p>To exploit the vulnerability, an attacker would have to send a malicious email to a user and convince the user to open the email. A connection to a remote SMB server could then be automatically initiated, enabling the attacker to brute-force attack the corresponding NTLM challenge and response in order to disclose the corresponding hash password. Depending on the URL contained in the malicious email, Outlook could fall back to initating a web request to a remote server, disclosing the the external IP of the user's system.</p> <p>The security update addresses the vulnerability by correcting how Outlook processes embedded URLs.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Office 2010 Service Pack 2 (32-bit editions) |  | [KB4022137](https://patchblox.com/security/data/fix/microsoft/kb4022137.md) | May 8, 2018 |
| Microsoft | Microsoft Office 2010 Service Pack 2 (64-bit editions) |  | [KB4022137](https://patchblox.com/security/data/fix/microsoft/kb4022137.md) | May 8, 2018 |
| Microsoft | Microsoft Office Compatibility Pack Service Pack 3 |  | [KB4018308](https://patchblox.com/security/data/fix/microsoft/kb4018308.md) | May 8, 2018 |
| Microsoft | Microsoft Office Web Apps Server 2010 Service Pack 2 |  | [KB4022142](https://patchblox.com/security/data/fix/microsoft/kb4022142.md) | May 8, 2018 |
| Microsoft | Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2 |  | [KB4022135](https://patchblox.com/security/data/fix/microsoft/kb4022135.md) | May 8, 2018 |

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Data as of 2026-11-07T18:46:35Z 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

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