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Security debt is accumulated risk that can build up even when an organization spends heavily on security. In a broad definition offered by security executive Selim Aissi, it can come from unpatched vulnerabilities, overlapping tools, unnecessary controls, weak automation, and poor visibility into sensitive data. The concern is not spending itself: it is investment that adds complexity without improving protection or resilience.
What do you mean by security debt?
In a September 10, 2026, CSO Online interview hosted by Joan Goodchild, Selim Aissi describes two related meanings. The narrower, common usage is the buildup of unpatched vulnerabilities. His broader management lens also includes risk created when security investments add complexity without making controls easier to operate or strengthening organizational resilience.
That broader view can include overlapping security tools, excessive controls, too little automation, and uncertainty about where sensitive data resides. These conditions can leave teams with more operational burden and less clarity about whether important risks are covered. A small budget is not, by itself, security debt—and a large one does not prove that an organization is resilient.
Why might security debt matter more than security spend?
The headline is a risk-management argument, not a quantified finding that security debt is universally more dangerous than spending. Aissi’s point is that spending is an input; the outcome depends on whether it reduces meaningful exposure and helps the organization withstand and recover from incidents.
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Adding a control or tool can be sensible when it addresses a credible risk, fits the environment, and works with existing defenses. But after reasonable defense in depth, automation, and integration are in place, additional layers that do not solve a defined problem can make the environment harder to understand and operate. There is no universal budget threshold or tool count that identifies this tipping point. Leaders must examine the risk addressed, the operational cost introduced, and the evidence that protection works.
How to compare adding controls with reducing security debt
Use these questions to assess a proposed security investment or a cleanup effort. They are a practical decision aid informed by Aissi’s interview and risk-outcome guidance, not a validated scoring model.
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| Decision lens | Adding a control or tool | Reducing accumulated complexity |
|---|---|---|
| Risk relevance | Does it address a credible exposure involving a critical system or sensitive data? | Will the work reduce a known vulnerability or close a meaningful visibility or protection gap? |
| Complexity and overlap | Does it integrate with current controls, or create another isolated layer? | Can overlapping or unnecessary controls be simplified without leaving a risk unaddressed? |
| Automation and visibility | Will it reduce manual work and improve understanding of assets or data? | Will it make asset and data locations clearer and routine security work more dependable? |
| Operational proof | How will the organization test the control and measure its effectiveness? | Can recovery, incident playbooks, and the remaining controls be exercised and verified? |
| Business communication | Can leaders explain the expected reduction in business exposure? | Can they describe the risk that remains after simplification and why it is acceptable or needs further work? |
How to turn security debt into an actionable plan
1. Start with critical systems and sensitive data
Identify the systems whose disruption would matter most to the business, then establish where sensitive data is held and how it moves. Aissi emphasizes considering data protection in transit, in use, at rest, and against leakage. This is interview guidance, not a claim that a particular standard or product is required.
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2. Prioritize vulnerabilities using evidence
Use the CISA Known Exploited Vulnerabilities Catalog as one input to vulnerability-management prioritization. CISA describes it as an authoritative source of vulnerabilities exploited in the wild and recommends it as an input; it is not a complete measure of an organization’s risk. Consider exposure and business importance alongside catalog status rather than treating the catalog as the whole priority list.
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3. Map controls, overlap, and manual work
For each priority risk, identify the controls intended to address it, whether those controls are integrated, and what work still depends on manual handoffs. Look for duplication or complexity that impedes visibility, response, or maintenance. The aim is not to remove tools indiscriminately; it is to retain defenses that reduce relevant risk and improve how the whole environment operates.
4. Test resilience, not just documentation
Check whether incident playbooks are clear and repeatedly exercised, whether recovery is tested, and whether controls perform as expected in practice. Policies and audit readiness can be useful, but Aissi argues for operational evidence: tested recovery, exercised response plans, appropriately placed controls, and measures of control effectiveness.
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5. Communicate exposure in business terms
Report which critical systems or business activities are exposed, the likely operational consequence, what is being done, and what residual risk remains. Aissi’s advice is to give the board a clear view of business risk rather than a large volume of security metrics. Metrics are useful when they help explain exposure, progress, or effectiveness—not as a substitute for that explanation.
How NIST can support the conversation
The NIST Cybersecurity Framework (CSF) 2.0, published February 26, 2024, provides high-level outcomes for understanding, assessing, prioritizing, and communicating cybersecurity efforts. It is a flexible risk-management reference; it does not prescribe how every outcome must be achieved or serve as certification or proof of resilience.
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NIST’s SP 1303, Cybersecurity Framework 2.0: Enterprise Risk Management Quick-Start Guide, finalized in October 2024, describes ways to integrate cybersecurity risk information into enterprise risk management. Its common language and outcomes can help organizations monitor, evaluate, and adjust risk across business units. Use these resources to structure the discussion, while keeping the assessment grounded in the organization’s own systems, data, and operations.
What the evidence does—and does not—establish
Aissi’s interview offers a useful way to think about accumulated security risk and operational fragility, but it does not quantify security debt against security spend or establish a universal budget optimum. Nor does it show that spending itself creates risk. The practical test is whether work reduces relevant exposure and improves resilience, and whether leaders can demonstrate that result in terms of business impact.
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