flaw
1. In computer security, an error of commission, an omission, or an oversight that allows protection mechanisms to be bypassed or disabled.
2. [An] error of commission, omission, or oversight in an information system (IS) that may allow protection mechanisms to be bypassed. [INFOSEC-99] Synonym loophole. [2382-pt.8]
3. An error of commission, omission, or oversight in a system that allows protection mechanisms to be bypassed[TCSEC]