What is CVE-2020-10146?

CVE-2020-10146 is a medium-severity vulnerability in Microsoft Teams, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2020-12-09.

How severe is CVE-2020-10146?

Medium severity. CVSS v3 base score is 5.7 out of 10.

XSS in Microsoft Teams

CVE-2020-10146

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-12-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.023 (82.9th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.023 · change: +0.003

Affected products

Microsoft Teams — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/oskarsve/ms-teams-rce (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-10146?: CVE-2020-10146 is a medium-severity vulnerability in Microsoft Teams, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2020-12-09.
How severe is CVE-2020-10146?: Medium severity. CVSS v3 base score is 5.7 out of 10.