How severe is CVE-2020-10146?

CVE-2020-10146 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-10146 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-10146?

CVE-2020-10146 affects Microsoft Teams. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-10146?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-10146 published?

CVE-2020-10146 was published on 2020-12-09 and last updated on 2026-06-17.

CVE-2020-10146

CVE-2020-10146 is a medium-severity vulnerability in Microsoft Teams with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.7)
CVSS v2: 3.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microsoft Teams
Published: 2020-12-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-10146?: CVE-2020-10146 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-10146 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-10146?: CVE-2020-10146 affects Microsoft Teams. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-10146?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-10146 published?: CVE-2020-10146 was published on 2020-12-09 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:microsoft:teams:*:*:*:*:*:*:*:*

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