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

> Stored XSS in Microsoft Teams displayName allows attackers to steal authentication tokens and potentially execute arbitrary commands.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Dec 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-8jq9-gwrr-4cqw

## What is CVE-2020-10146?

CVE-2020-10146 is a medium-severity cross-site scripting vulnerability in Microsoft Teams, published on 9 Dec 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2020-10146?

It affects 1 product.


Products: Microsoft Teams.

## How do I fix CVE-2020-10146?

No fix has been published for CVE-2020-10146 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-10146 being exploited?

There is no known exploitation of CVE-2020-10146 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Teams

- [CVE-2026-65667](https://insights.sbomify.com/CVE-2026-65667/): Microsoft Teams Elevation of Privilege Vulnerability (critical 10.0)
- [CVE-2026-62896](https://insights.sbomify.com/CVE-2026-62896/): Microsoft Teams Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2026-33823](https://insights.sbomify.com/CVE-2026-33823/): Microsoft Team Events Portal Information Disclosure Vulnerability (critical 9.6)
- [CVE-2026-65767](https://insights.sbomify.com/CVE-2026-65767/): Microsoft Teams for Android Spoofing Vulnerability (high 8.8)
- [CVE-2026-65768](https://insights.sbomify.com/CVE-2026-65768/): Microsoft Teams Remote Code Execution Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-10146 and fix it if it is affected.

What it is: CVE-2020-10146 is a medium-severity cross-site scripting vulnerability in Microsoft Teams, published on 9 Dec 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-10146 in the wild and no public exploit code.

Affected product: Microsoft Teams. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-10146/ (Markdown: https://insights.sbomify.com/CVE-2020-10146/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10146
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10146
- OSV: https://osv.dev/vulnerability/CVE-2020-10146

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-10146/
Summaries are generated and may contain mistakes; the official description above is the record.