To some degree, yes. The ability to jailbreak a phone is indicative of a poor security framework. In theory, there should be a chain of security from the bootloader, to the kernel, the full operating system that should be secure.
If someone is able to break that chain of security, then that demonstrates a weakness in security.
The question then becomes how easy is it for an attacker to break that chain of security, and is the jailbreak remotely exploitable.
If someone is able to break that chain of security, then that demonstrates a weakness in security.
The question then becomes how easy is it for an attacker to break that chain of security, and is the jailbreak remotely exploitable.