Improper Access Control
WebKit/Source/devtools/front_end/devtools.js in the Developer Tools (aka DevTools) subsystem in Blink, as used in Google Chrome before 51.0.2704.79, does not ensure that the remoteFrontendUrl parameter is associated with a chrome-devtools-frontend.appspot.com URL, which allows remote attackers to bypass intended access restrictions via a crafted URL.
CWE-284 - Improper Access Control
Listed 5th in the 'OWASP Top Ten', improper (or broken) access control attacks are a fundamental type of vulnerability. This includes a broad range of design flaws that enable users to act outside of their intended permissions. They can use these privileges to gain access to restricted files and functionality such as accessing restricted information, falsifying records, destroying data, or executing commands.