How should organisations reduce security failures caused by human error and phishing?

Why This Matters for Security Teams

Human error and phishing remain high-value attack paths because they exploit normal work behaviour: urgency, trust, and routine approvals. The question is not whether employees can be trained to make fewer mistakes, but whether the organisation has reduced the impact of the mistakes that still happen. Current guidance from NIST SP 800-53 Rev 5 Security and Privacy Controls treats awareness as only one layer among many, which is the right framing.

NHI Management Group research shows why layered defence matters: in The State of Non-Human Identity Security, only 1.5 out of 10 organisations reported high confidence in securing NHIs, while lack of credential rotation was cited as a top attack cause by 45% of respondents. That matters because phishing is often the entry point, but stolen credentials and poor access hygiene are what let attackers turn one mistake into sustained compromise. In practice, many security teams encounter the breach only after a user has already approved the wrong request or reused the wrong credential, rather than through intentional detection.

How It Works in Practice

Reducing failure from phishing and human error requires controls that assume people will occasionally click, approve, or disclose something they should not. Security awareness training still matters, but it should be paired with technical guardrails that limit what a mistake can do. The strongest programmes combine phishing-resistant authentication, least privilege, patching discipline, and rapid reporting paths so the first alert arrives before the attacker can move laterally.

At the policy level, organisations should map this to established control families such as NIST SP 800-53 Rev 5, especially access control, awareness and training, incident response, and configuration management. At the operational level, the right sequence is straightforward:

• Use multifactor authentication everywhere that sensitive data, admin functions, or external access is involved.
• Prefer phishing-resistant methods where feasible, especially for administrators and high-risk users.
• Keep patching and software updates on a fixed schedule, not an ad hoc basis.
• Remove standing access that is not required for daily work.
• Give staff a simple reporting path for suspicious messages, login prompts, and payment or password-reset requests.

For identity-centric attacks, the lesson from NHIMG research is that credential misuse often succeeds because tokens, passwords, or OAuth grants remain valid after the initial compromise. The CoPhish OAuth Token Theft via Copilot Studio case is a reminder that a single approval event can expose downstream systems if token scope, monitoring, and revocation are weak. These controls tend to break down when users have broad delegated access, because one phish can then become a trusted session rather than a blocked attempt.

Common Variations and Edge Cases

Tighter anti-phishing controls often increase friction, requiring organisations to balance user convenience against containment strength. There is no universal standard for this yet, especially where contractors, executives, and remote staff use different devices and apps. Current guidance suggests prioritising the highest-risk roles first, then extending controls once the operating model is stable.

One common edge case is where awareness training is strong but identity controls are weak. In those environments, staff may report suspicious activity quickly, yet the attacker still succeeds because the account has legacy permissions, long-lived sessions, or poor token hygiene. Another case is the opposite: technology is strong, but users are afraid to report mistakes. That delays containment and lets an email or malicious link spread further.

Phishing-resistant MFA, patching, and reporting workflows should also be tested against real workflows, not just policy statements. The Poland Military Breach illustrates how quickly trust in normal communication channels can be abused once attackers understand the target’s internal habits. Organisations that rely on annual training alone usually discover the gap after an employee has already handed over access or approved the wrong request, rather than before the attacker gets a foothold.

Related resources from NHI Mgmt Group

• How should security teams reduce the impact of phishing and BEC on human users?
• How can security teams reduce human error without blaming users?
• How should healthcare organisations reduce human-error breaches without slowing down clinical work?
• How should security teams reduce the risk of clone phishing in email-heavy organisations?