# CVE-2018-0940: Microsoft Exchange Elevation of Privilege Vulnerability

CVE-2018-0940 is fixed in 6 products on 1 platform, first by KB4073537, released March 13, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-0940
- Priority: Routine
- CVSS: n/a (Moderate)
- EPSS: 0.0728
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Mar 13, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-0940

## Description

<p>An elevation of privilege vulnerability exists when Microsoft Exchange Outlook Web Access (OWA) fails to properly sanitize links presented to users. An attacker who successfully exploited this vulnerability could override the OWA interface with a fake login page and attempt to trick the user into disclosing sensitive information.</p> <p>To exploit the vulnerability, an attacker could send a specially crafted email message containing a malicious link to a user. The user would have to click the malicious link in order to be susceptible to the vulnerability.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Exchange rewrites links presented within the body of emails.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 20 |  | [KB4073537](https://patchblox.com/security/data/fix/microsoft/kb4073537.md) | Mar 13, 2018 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 18 |  | [KB4073392](https://patchblox.com/security/data/fix/microsoft/kb4073392.md) | Mar 13, 2018 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 19 |  | [KB4073392](https://patchblox.com/security/data/fix/microsoft/kb4073392.md) | Mar 13, 2018 |
| Microsoft | Microsoft Exchange Server 2013 Service Pack 1 |  | [KB4073392](https://patchblox.com/security/data/fix/microsoft/kb4073392.md) | Mar 13, 2018 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 7 |  | [KB4073392](https://patchblox.com/security/data/fix/microsoft/kb4073392.md) | Mar 13, 2018 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 8 |  | [KB4073392](https://patchblox.com/security/data/fix/microsoft/kb4073392.md) | Mar 13, 2018 |

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