Cybersecurity for Startups: The 10 Controls That Actually Matter
You do not need a $500k security programme to protect your startup — you need to implement the ten controls that prevent 90% of attacks.
The Threat Model for Startups
Startups are not targeted the way large enterprises are — but they are targeted. The attackers are usually opportunistic: automated scans looking for exposed credentials, unpatched software, and misconfigured cloud storage. The good news is that opportunistic attacks are also the easiest to defend against with a basic set of well-implemented controls.
The Pareto principle applies to security: 20% of the controls block 80% of the realistic attacks. The following ten controls are specifically chosen for startups — high impact, reasonable implementation cost, and proportionate to the actual threat landscape rather than a compliance checklist written for enterprises.
Controls 1–3: Identity and Access
Control 1: Enforce MFA on every account — Google Workspace, GitHub, AWS, Slack, everything. Phishing-resistant hardware keys (YubiKey) are best; authenticator app TOTP is acceptable. SMS-based MFA is weak but still better than nothing. Control 2: Deploy SSO for all major SaaS tools so that offboarding a departing employee or contractor deactivates all access in one step. Control 3: Apply least privilege — every service account, AWS IAM role, and API credential should have only the permissions it needs for its specific function, nothing more.
These three controls alone block the majority of credential-based attacks, which account for over 80% of breaches according to Verizon's Data Breach Investigations Report.
Controls 4–6: Code and Secrets
Control 4: Never commit secrets to version control. Use pre-commit hooks (detect-secrets, git-secrets) to prevent it and a secrets manager (Doppler, AWS Secrets Manager) for distribution. Control 5: Enable automated dependency scanning (GitHub Dependabot or Snyk) and address critical CVEs within 48 hours. Vulnerable dependencies are the path of least resistance for sophisticated attackers. Control 6: Enforce code review for all production changes — no direct pushes to main. Two pairs of eyes on every change catches both security issues and bugs.
These controls address the software supply chain, which has become a significant attack vector since the SolarWinds and Log4Shell incidents.
Controls 7–8: Cloud and Infrastructure
Control 7: Enable cloud-native security posture management. AWS Security Hub, GCP Security Command Center, and Azure Defender are available at low or no cost and continuously scan your cloud configuration for misconfigurations — public S3 buckets, overly permissive security groups, unencrypted databases. Control 8: Enable logging everywhere — CloudTrail for AWS API activity, VPC flow logs, application access logs — and retain them for at least 90 days. You cannot investigate an incident you have no logs for.
A striking number of startups we work with have misconfigured cloud storage or permissive IAM policies that have been in place for months. A one-hour cloud configuration review often uncovers issues that would be catastrophic if exploited.
Controls 9–10: Incident Response and Employee Security
Control 9: Have a written incident response plan, even a simple one. Who do you call if you discover a breach at 11pm? What do you tell customers? What are your legal notification obligations? A one-page runbook that answers these questions is infinitely better than improvising during an active incident. Control 10: Run annual phishing simulation and security awareness training for all employees. Phishing is still the most common initial access vector. Training that includes real simulated phishing emails is demonstrably more effective than annual checkbox training videos.
Security for startups is not about perfection — it is about not being the easiest target. Implement these ten controls and you will have materially better security posture than the majority of similarly sized companies. If you are approaching a fundraising round, Series A and beyond investors increasingly conduct security diligence, and being able to demonstrate these controls is a differentiator.
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