What’s Vulnerable › Vulnerabilities

CVE-2020-10146: Microsoft Teams displayName stored cross-site scripting vulnerability

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-09 · updated 2026-06-17
• Weakness: CWE-79

Description

The Microsoft Teams online service contains a stored cross-site scripting vulnerability in the displayName parameter that can be exploited on Teams clients to obtain sensitive information such as authentication tokens and to possibly execute arbitrary commands. This vulnerability was fixed for all Teams users in the online service on or around October 2020.

Affected products

• Microsoft Teams: before 2020-10-29 — fixed in 2020-10-29
• Microsoft Teams: before on or about October 2020 — fixed in on or about October 2020

How to fix

Upgrade to a fixed version: Microsoft Teams 2020-10-29; Microsoft Teams on or about October 2020. Check the vendor advisory for mitigations.

References

• https://github.com/oskarsve/ms-teams-rce
• https://github.com/oskarsve/ms-teams-rce

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