# CVE-2018-8374: Microsoft Exchange Server Tampering Vulnerability

CVE-2018-8374 is fixed in 2 products on 1 platform, first by KB4340731, released August 14, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-8374
- Priority: Routine
- CVSS: n/a (Moderate)
- EPSS: 0.0327
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Aug 14, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8374

## Description

<p>A tampering vulnerability exists when Microsoft Exchange Server fails to properly handle profile data. An attacker who successfully exploited this vulnerability could modify a targeted user's profile data.</p> <p>To exploit the vulnerability, an attacker would need to be authenticated on an affected Exchange Server. The attacker would then need to send a specially modified request to the server, targeting a specific user.</p> <p>The security update addresses the vulnerability by modifying how Microsoft Exchange Server handles profile data.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 10 |  | [KB4340731](https://patchblox.com/security/data/fix/microsoft/kb4340731.md) | Aug 14, 2018 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 9 |  | [KB4340731](https://patchblox.com/security/data/fix/microsoft/kb4340731.md) | Aug 14, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo