CVE-2026-20206 Cisco ThousandEyes BrowserBot Command Injection Vulnerability
Authenticated attackers can execute arbitrary commands on BrowserBot agents via crafted input in transaction tests.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-20206 being exploited?
There is no known exploitation of CVE-2026-20206 in the wild and no public exploit code.
Sources
Also known as GHSA-rpgf-jpf7-q7f5.