CVE-2020-17091 Microsoft Teams Remote Code Execution Vulnerability
An attacker can execute arbitrary code on systems running Microsoft Teams, requiring immediate patching by users and administrators.
- 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-2020-17091?
CVE-2020-17091 is a high-severity code injection vulnerability in Microsoft Teams, published on 11 Nov 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
Microsoft Teams Remote Code Execution Vulnerability
Weakness: CWE-94
Which versions are affected by CVE-2020-17091?
It affects 1 product.
Products include Microsoft Teams.
How do I fix CVE-2020-17091?
No fix has been published for CVE-2020-17091 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2020-17091 being exploited?
There is no known exploitation of CVE-2020-17091 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Teams
- CVE-2026-65667 Microsoft Teams Elevation of Privilege Vulnerability
- CVE-2026-62896 Microsoft Teams Elevation of Privilege Vulnerability
- CVE-2026-33823 Microsoft Team Events Portal Information Disclosure Vulnerability
- CVE-2026-65767 Microsoft Teams for Android Spoofing Vulnerability
- CVE-2026-65768 Microsoft Teams Remote Code Execution Vulnerability
Sources
Also known as GHSA-qg4c-rjgj-mr82.