CVE-2026-20206 PUBLISHED

Cisco ThousandEyes BrowserBot Command Injection Vulnerability

Assigner: cisco
Reserved: 08.10.2025 Published: 20.05.2026 Updated: 21.05.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS Score: 6.3

Product Status

Vendor Cisco
Product Cisco ThousandEyes Enterprise Agent
Versions Default: unknown
  • Version Agent 5.0 is affected
  • Version Agent 4.4.4 is affected
  • Version Agent 4.4.3 is affected
  • Version Agent 4.4.2 is affected
  • Version Agent 4.2 is affected
  • Version Agent 4.1 is affected
  • Version Agent 4.0 is affected
  • Version Agent 5.1 is affected
  • Version Agent 5.1.2 is affected
  • Version Agent 5.1.3 is affected

Exploits

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

Problem Types

  • Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') cwe