// appsec · 5 min
The OWASP Top 10, Explained for Business Leaders
The OWASP Top 10 is the most-cited list in application security — and the most misunderstood outside engineering. Here is what it actually means for the business.
What it is
A consensus ranking of the most critical web application risk categories, maintained by the Open Worldwide Application Security Project. It is not a compliance standard, a checklist, or a guarantee — it is a shared vocabulary for the ways applications actually get breached.
Broken access control — users seeing data that isn\'t theirs — is the #1 category, and the cause of most SaaS tenant-data leaks. If you test one thing, test that.
The categories that hurt businesses most
- Broken access control — users seeing or changing data that isn't theirs. The #1 category, and the one behind most tenant-data leaks in SaaS.
- Injection — attacker input executed as code or queries. Old, well-understood, still everywhere.
- Security misconfiguration — default credentials, open cloud storage, verbose errors. Cheap to fix, expensive to ignore.
- Vulnerable components — the open-source libraries inside your product carry their own flaws into your risk register.
Three questions to ask your team
- "When did we last test access control across user roles and tenants — manually, not with a scanner?"
- "How do we know which of our dependencies have known vulnerabilities right now?"
- "If a tester chained two medium findings into account takeover, would our monitoring notice?"
A penetration test mapped to the OWASP Top 10 and OWASP WSTG answers all three with evidence, not assurances.
Concerned about any of this in your environment?
I help organisations test, find, and fix exactly these issues — with evidence, not scanner output. Start with a no-obligation conversation.
Written by Abdullah Bin Zarshaid, MSc, CEH — independent security consultant.
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