Abstract: The disclosed computer-implemented method for preventing unauthorized access to computing devices implementing computer accessibility services may include (i) detecting, at a client computing device, an instruction to perform a user interface action utilizing a computer accessibility service, (ii) determining, at the client computing device, whether the instruction was triggered based on a touch event initiated by a user of the client computing device, and (iii) performing, at the client computing device, a security action in response to determining that the instruction was not triggered based on a touch event initiated by the user. Various other methods, systems, and computer-readable media are also disclosed.