An authorization failure happens when a system receives a request but does not correctly verify whether the requester has permission to perform that action. It is different from authentication: authentication asks “who are you?”, while authorization asks “are you allowed to do this?” If that check is missing, weak, or bypassed, an attacker may access functions, data, or administrative features that should be blocked.
In cyber security, authorization failures are serious because they often expose high-value paths such as management consoles, APIs, and file-handling services. They can lead to remote code execution, data exposure, or full device compromise if privileged actions are reachable without proper checks. Defenders look for exposed admin interfaces, inconsistent access-control rules, and requests that succeed without a valid role or session. Strong segmentation, least privilege, and thorough access-control testing help prevent this class of flaw.