CVE-2020-1493 Microsoft Outlook Information Disclosure Vulnerability
An attacker can share attached files via email links, allowing unauthorized anonymous access to restricted data in Microsoft Outlook.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-1493?
CVE-2020-1493 is a medium-severity vulnerability in Microsoft 365 Apps, published on 17 Aug 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-922
Which versions are affected by CVE-2020-1493?
It affects 3 products.
Products include Microsoft 365 Apps, Microsoft Office, Microsoft Outlook.
How do I fix CVE-2020-1493?
No fix has been published for CVE-2020-1493 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-1493 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-1493 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft 365 Apps
- CVE-2024-21413 Microsoft Outlook Improper Input Validation
- CVE-2023-23397 Microsoft Office Outlook Privilege Escalation
- CVE-2024-38189 Microsoft Project Remote Code Execution Vulnerability
- CVE-2023-35311 Microsoft Outlook Security Feature Bypass
- CVE-2026-21514 Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision
Sources
Also known as GHSA-w39r-2vjm-hgjq.