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12/07/2026 12:26 pm
TL;DR: Cyber insurers are increasingly asking organisations to prove resilience, containment, and control effectiveness before claims are paid, while breach costs average $4.4 million and ransomware demands keep rising, according to IBM Cost of a Data Breach Report 2025. The practical shift is clear: security programmes now have to demonstrate reduced blast radius, not just promise it.
NHIMG editorial — based on content published by Illumio: Cyber insurance is getting stricter and why resilience proof matters
By the numbers:
- According to the IBM Cost of a Data Breach Report 2025, the average cost of a data breach is now $4.4 million.
Questions worth separating out
Q: What breaks when cyber insurance controls are only documented and not continuously proven?
A: Coverage can fail at claim time because insurers assess the actual state of controls, not the organisation’s intent.
Q: Why do lateral movement and excessive privilege matter to cyber insurers?
A: They determine how far a breach can spread after the first compromise.
Q: How do security teams know whether segmentation is actually reducing risk?
A: They need evidence that critical systems are isolated, identity pathways are bounded, and prohibited connections are blocked in practice.
Practitioner guidance
- Document containment evidence for underwriting Build a packet of proof that shows how segmentation, identity boundaries, and monitoring reduce blast radius around critical systems.
- Map identity pathways to lateral movement risk Identify where human and non-human identities can pivot into sensitive assets, especially through service accounts, shared secrets, and over-broad roles.
- Validate that security controls are working at claim time Create recurring tests that confirm segmentation, access limits, and monitoring are functioning before an incident occurs.
What's in the full article
Illumio's full blog covers the operational detail this post intentionally leaves for the source:
- How its segmentation approach is positioned for hybrid environments with mixed human and non-human access patterns
- What the vendor says insurers look for in proof of resilience during underwriting and claims review
- How its observability capability is described for validating policy enforcement before and after an incident
- The specific way the article links network containment to reduced insurance risk and lower business disruption
👉 Read Illumio's analysis of cyber insurance, segmentation, and resilience →
Cyber insurance and Zero Trust Segmentation: are controls keeping up?
Explore further
12/07/2026 12:39 pm
Cyber insurance is now a test of control evidence, not just coverage purchase. The article reflects a wider market shift in which insurers want proof that organisations can reduce blast radius and contain compromise. That moves security maturity from a compliance narrative to an operational one, where identity governance, segmentation, and recovery evidence all matter. Practitioners should treat underwriting questions as a control validation exercise, not a paperwork exercise.
A question worth separating out:
Q: Who is accountable when cyber insurance expectations and security controls diverge?
A: Accountability usually sits with the security, risk, and infrastructure leaders who own control design, evidence collection, and incident readiness. When controls are not measurable, the organisation cannot defend its resilience posture to insurers, auditors, or the board. The practical answer is shared ownership with clear evidence responsibilities.
👉 Read our full editorial: Cyber insurance is tightening around proof of containment and resilience
