Selenium Server (Grid) before 4 allows CSRF because it permits non-JSON content types such as application/x-www-form-urlencoded, multipart/form-data, and text/plain.

Selenium Selenium Grid (formerly Selenium Standalone Server) Fixed in 4.0.0-alpha-7 is affected by: DNS rebinding. The impact is: execute arbitrary code (remote). The component is: WebDriver endpoint of Selenium Grid / Selenium Standalone Server. The attack vector is: Triggered by browsing to to a malicious remote web server. The WebDriver endpoint of Selenium Server (Grid) is vulnerable to DNS rebinding. This can be used to execute arbitrary code on the machine.