# CVE-2026-20206: Cisco ThousandEyes BrowserBot Command Injection Vulnerability

> Authenticated attackers can execute arbitrary commands on BrowserBot agents via crafted input in transaction tests.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 May 2026
- **Updated:** 21 May 2026
- **Also known as:** GHSA-rpgf-jpf7-q7f5

## What is CVE-2026-20206?

CVE-2026-20206 is a medium-severity command injection vulnerability in Cisco ThousandEyes Enterprise Agent, published on 20 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the BrowserBot component of Cisco ThousandEyes Enterprise Agent could have allowed an authenticated, remote attacker to execute arbitrary commands on Agents on behalf of the BrowserBot synthetics orchestration process. Cisco has addressed this vulnerability in the Cisco ThousandEyes Enterprise Agent, and no customer action is needed.

This vulnerability was due to insufficient input validation of command arguments that are supplied by the user. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by authenticating to the ThousandEyes SaaS and submitting crafted input into the affected parameter. A successful exploit could have allowed the attacker to execute arbitrary commands within the BrowserBot container as the node user.
To exploit this vulnerability, the attacker must have valid user credentials for the ThousandEyes SaaS and the ability to manage transaction tests.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-20206?


## How do I fix CVE-2026-20206?

No fix has been published for CVE-2026-20206 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20206 being exploited?

There is no known exploitation of CVE-2026-20206 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20206 and fix it if it is affected.

What it is: CVE-2026-20206 is a medium-severity command injection vulnerability in Cisco ThousandEyes Enterprise Agent, published on 20 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-20206 in the wild and no public exploit code.

Affected product: Cisco ThousandEyes Enterprise Agent. 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-2026-20206/ (Markdown: https://insights.sbomify.com/CVE-2026-20206/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20206
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20206
- OSV: https://osv.dev/vulnerability/CVE-2026-20206

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20206/
Summaries are generated and may contain mistakes; the official description above is the record.