CVE-2026-20206
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Command Injection in Cisco ThousandEyes Enterprise Agent

Publication date: 2026-05-20

Last updated on: 2026-05-20

Assigner: Cisco Systems, Inc.

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.
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Meta Information
Published
2026-05-20
Last Modified
2026-05-20
Generated
2026-06-10
AI Q&A
2026-05-20
EPSS Evaluated
2026-06-08
NVD
CVE-2026-20206
EUVD
EUVD-2026-31136
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
cisco thousandeyes_enterprise_agent *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
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Executive Summary

CVE-2026-20206 is a command injection vulnerability in the BrowserBot component of the Cisco ThousandEyes Enterprise Agent.

An authenticated remote attacker with valid ThousandEyes SaaS credentials and the ability to manage transaction tests could exploit this flaw by submitting crafted input to execute arbitrary commands within the BrowserBot container as the node user.

The vulnerability is caused by insufficient input validation of command arguments supplied by the user.

Cisco has addressed this issue in the cloud-based ThousandEyes service, and no customer action is required.

Impact Analysis

If exploited, this vulnerability could allow an authenticated attacker to execute arbitrary commands on the affected ThousandEyes Enterprise Agent within the BrowserBot container.

This could lead to unauthorized actions being performed on the system with the privileges of the node user, potentially compromising the integrity, confidentiality, and availability of the affected system.

Detection Guidance

There are no specific detection commands or methods provided to identify this vulnerability on your network or system.

Detection would generally require verifying if the affected version of Cisco ThousandEyes Enterprise Agent is in use and if an attacker has authenticated access to the ThousandEyes SaaS with permissions to manage transaction tests.

Mitigation Strategies

Cisco has addressed this vulnerability in the cloud-based ThousandEyes service, and no customer action is needed.

There are no available workarounds or immediate mitigation steps required from customers.

Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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