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". . Trust built the temple. Identity can break it . ."
When speaking with CISOs and security leaders globally, one theme comes through strongly . . The greatest threats are often internal.
Insider threat is any risk that arises from someone with legitimate access to systems, whether employees, contractors, third-party vendors, or business partners.
These are individuals who know where the sensitive data resides, how systems interact, and how the organisation functions day to day.
Industry research shows that over 60% of breaches involve compromised privileged credentials. Nearly 45% of malicious insider activity goes undetected for more than 3 months.
Third party and partner compromises accounted for over 30% of breaches in 2025, up from 16%, 3 years earlier.
These are not always ransomware or malware incidents. Often, breaches involve misuse of trusted access.
Why is insider threat so challenging?
External attackers leave detectable traces (unusual IP addresses, logins at unexpected times, or network anomalies). Insiders blend in.
Their credentials, access rights, and behaviour appear legitimate. Standard security tools often fail to detect the problem until significant damage has occurred.
Entasis Partners advise clients to move beyond perimeter based security and adopt an identity-centric approach.
This includes implementing least-privilege access, continuous authentication, session monitoring, and behavioural analytics to detect anomalies even with valid credentials.
We emphasise the importance of offboarding processes and proactive access management.
It’s not only about technology. Addressing insider threats is equally about culture and process.
Organisations must cultivate awareness, define accountability, and ensure that operational procedures reduce the risk of both inadvertent and malicious misuse. Security teams that overlook the human element will continue to respond reactively, rather than preventively.
We also field common questions from leaders;
· How do you balance security with productivity?
· How do you ensure third-party partners adhere to standards?
These are not easy answers, but they are essential to understanding the full picture of organisational risk.
