Insecure file permissions are weak ownership or access settings that let an untrusted user read, modify, or influence a file or directory. In Linux systems, this often means a sensitive path is writable by the wrong account, readable by everyone, or owned in a way that a privileged service does not expect.
This matters because many attacks begin with local access and then abuse permissions to gain more power. If a backup tool, plugin, or admin component trusts files in a writable location, an attacker may edit configuration, replace scripts, or alter data that a root-level process later uses. Defenders look for correct ownership, least-privilege modes, and tight control over backup-related paths, especially in hosting platforms where a small permission mistake can become a local privilege-escalation path.