Every security budget assumes the danger is outside the building, trying to get in. Some of the most damaging incidents we investigate involve someone who was already inside, already trusted, and already holding a login that worked perfectly well right up until the moment they misused it, deliberately or otherwise, without triggering a single external alarm.
Insider risk is not always really about malice
Insider threats fall into two very different categories that get lumped together far too often. There is the genuinely malicious employee, perhaps disgruntled after being passed over for promotion, deliberately taking data on the way out. Far more common is the negligent one, someone who forwards a sensitive spreadsheet to a personal email account to work on over the weekend, or reuses a work password on a personal account that later gets breached, handing attackers a working credential without any bad intent at all. The outcome for the business can be identical either way.
An internal network pen testing engagement is where this risk actually gets measured properly, testing what a standard employee account can reach if it were compromised or misused, rather than assuming trust automatically equals safety across the board simply because someone has worked there for years.
Most businesses give their staff more access than the role actually requires
Least privilege is the antidote to insider risk, yet it is rarely applied with any real discipline. Employees accumulate access across every team they have ever worked with, every project they have ever touched, and every temporary cover shift they have ever filled in for, and almost nobody goes back to remove access once the need has genuinely passed. The result is a workforce holding far more reach into sensitive systems than their current job actually requires on any given day, quietly widening the blast radius of any single compromised account.
William shared an example that has genuinely stuck with him from a recent internal assessment.
“An employee from marketing still had full read access to the HR system, six years after covering a two-week absence during a genuinely busy period for the whole company. Nobody had ever revisited it, and she genuinely had no idea she still had it until we showed her the access logs ourselves.”
— William Fieldhouse, Director of Aardwolf Security Ltd
That employee never misused the access, and probably never would have. But the same forgotten permission, sitting on a different account compromised by phishing, becomes a direct route to sensitive HR records for anyone who gets in. Trust in the person is not the same as safety in the system, and treating the two as interchangeable is precisely how these gaps survive for years without anyone ever noticing they exist.
Build a culture that assumes access should expire
Review permissions on a fixed schedule rather than waiting for someone to notice a problem, remove access the moment a role or project genuinely ends, and monitor for unusual data access patterns rather than only unusual logins from outside. This is not about distrusting your own staff. It is about making sure trust in a person never quietly becomes an unmonitored gap in the system. A penetration testing quote from Aardwolf Security can include a proper internal review scoped specifically around insider risk, so contact us to see where your own organisation currently stands.