An information disclosure vulnerability exists in the way that Microsoft Exchange Server handles importing data. If an impacted user is using Microsoft Exchange Outlook Web Access (OWA), the vulnerability could allow an attacker to discover sensitive information that should otherwise not be disclosed.
To exploit the vulnerability, an attacker would have to upload a specially crafted file to Microsoft Exchange Outlook Web Access (OWA).
The security update addresses the vulnerability by correcting how Microsoft Exchange handles importing data.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | 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 | --- 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.