OWASP Top 10 Explained Simply (2025)
The OWASP Top 10:2025 is a community consensus list of the most critical web application security risks. In plain language: start with access control and configuration, watch the software supply chain, then cryptography, injection, design, authentication, integrity, logging/alerting, and handling failures. Use it as a defence checklist, not as an attack recipe.
Friends, interviews ask "What is the OWASP Top 10?". The 2025 list shifted — more weight on the supply chain. Today we walk each category in simple English as a vertical list. No exploit PoC — only what the risk is and what a defender does.
मित्रांनो, मुलाखतीत "OWASP Top 10 काय आहे?" विचारले जाते. दोन हजार पंचवीसची यादी थोडी बदलली – पुरवठा साखळीवर जास्त भर. आज प्रत्येक गट सोप्या इंग्रजीत उभ्या यादीत बघूया. हल्ल्याचे उदाहरण नाही – फक्त धोका काय आणि रक्षक काय करतो.
मित्रों, साक्षात्कार में "OWASP Top 10 क्या है?" पूछा जाता है. दो हज़ार पच्चीस की सूची थोड़ी बदली – सप्लाई श्रृंखला पर ज़्यादा ज़ोर. आज हर वर्ग सरल अंग्रेज़ी में ऊर्ध्व सूची में देखेंगे. हमले का उदाहरण नहीं – सिर्फ़ जोखिम क्या और रक्षक क्या करता है.
Quick answer
Official Top 10:2025 (source: owasp.org/Top10/2025/):
- A01 Broken Access Control — users can act outside their permission.
- A02 Security Misconfiguration — unsafe defaults, open cloud storage, verbose errors.
- A03 Software Supply Chain Failures — tainted dependencies, build, or distribution.
- A04 Cryptographic Failures — weak or missing protection for sensitive data.
- A05 Injection — untrusted input changes queries or commands (includes SQL injection).
- A06 Insecure Design — missing security requirements in the design itself.
- A07 Authentication Failures — weak login, session, or credential handling.
- A08 Software or Data Integrity Failures — unsigned updates, untrusted CI artifacts.
- A09 Security Logging and Alerting Failures — you cannot see or wake up to attacks.
- A10 Mishandling of Exceptional Conditions — errors and edge cases create risk.
Defender one-liners:
A01 Enforce deny-by-default authorization on every object/action
A02 Harden configs; no default passwords; minimal open services
A03 Pin/sign dependencies; verify build pipeline integrity
A04 TLS in transit; strong crypto at rest; no homemade ciphers
A05 Parameterized queries; validate input; least privilege DB user
A06 Threat-model features before coding
A07 MFA; secure session cookies; rate-limit logins
A08 Signed updates; protect CI/CD secrets
A09 Log authz failures; alert on suspicious bursts
A10 Fail closed; do not leak stack traces to users
What do I need before this guide?
- Curiosity about how web apps fail safely.
- Optional: basic idea of HTTP, sessions and a database.
- This page is awareness for defenders and builders — not a penetration-testing manual.
What changed versus older Top 10 lists?
OWASP Top 10:2025 highlights broken access control, misconfiguration and software supply chain failures first — use it as a defence checklist.
OWASP Top 10:2025 मध्ये तुटलेले प्रवेश नियंत्रण, चुकीची रचना आणि सॉफ्टवेअर पुरवठा साखळी अपयश प्रथम येतात — हे बचावाची यादी म्हणून वापरा.
OWASP Top 10:2025 में टूटा प्रवेश नियंत्रण, गलत विन्यास और सॉफ़्टवेयर आपूर्ति श्रृंखला की नाकामियाँ पहले हैं — इसे बचाव सूची की तरह इस्तेमाल करो.
High-level shifts defenders should remember:
- Broken Access Control remains the top category — IDOR and missing server-side checks still dominate real breaches.
- Security Misconfiguration moved up — cloud buckets, headers, and default installs matter more than ever.
- Software Supply Chain Failures is a major 2025 emphasis (broader than “outdated components” alone).
- Injection is still present (now A05) — parameterized queries remain mandatory.
- Mishandling of Exceptional Conditions is new as A10 — error paths and edge cases are first-class risks.
- Always confirm details on the official OWASP pages; translations and companion docs expand over time.
What does each category mean in practice?
A01 — Broken Access Control
- Problem: a user reads or changes another user’s object by guessing an ID.
- Defence: check authorization on the server for every request; prefer deny by default; automated tests for horizontal/vertical privilege cases.
A02 — Security Misconfiguration
- Problem: admin panels open to the world, directory listing, default creds, overly verbose errors.
- Defence: hardened baselines, remove unused features, separate prod config, repeatable infrastructure as code.
A03 — Software Supply Chain Failures
- Problem: malicious or compromised library, build system, or update channel.
- Defence: lockfiles, checksums/signatures, private package mirrors when needed, restricted CI credentials, SBOMs where required.
A04 — Cryptographic Failures
- Problem: sensitive data sent or stored without appropriate crypto; outdated algorithms.
- Defence: TLS everywhere that needs it; proven libraries; secrets in a vault — not in git.
A05 — Injection
- Problem: input becomes SQL, LDAP, OS command, or template code.
- Defence: parameterized queries / ORM bind parameters; careful encoding; least-privilege DB accounts. See SQL injection prevention.
A06 — Insecure Design
- Problem: the feature cannot be “patched secure” because the design trusts the client.
- Defence: threat modeling, abuse cases, secure design reviews before build.
A07 — Authentication Failures
- Problem: credential stuffing, weak session IDs, missing MFA for sensitive actions.
- Defence: MFA, breached-password checks, secure cookie flags, rate limits, session rotation on login.
A08 — Software or Data Integrity Failures
- Problem: auto-update without signature checks; CI drops unsigned artifacts.
- Defence: sign and verify releases; protect build pipelines; review deserialization carefully.
A09 — Security Logging and Alerting Failures
- Problem: attacks succeed silently.
- Defence: log logins, failures, access-control denials; protect log integrity; alert on patterns — see SOC lessons.
A10 — Mishandling of Exceptional Conditions
- Problem: timeouts, partial failures, or unexpected input leave the app in an unsafe state or leak internals.
- Defence: fail closed, generic user errors, well-tested error paths, no stack traces in production responses.
Ravindra Bagale's Tip
💡 In interviews, do not only recite the Top 10 — give one example. "A01: user A changes the id in the URL and opens user B’s invoice — no server authz check." Defence in one line: "server-side authorization every request." That impresses interviewers.
Ravindra Bagale's Tip – मराठी
💡 Interview मध्ये Top 10 रटून सांगायचं नाही – एक example द्या. "A01: user A च्या URL मध्ये id बदलून user B चा invoice उघडतो – server authz check नाही." Defence एक वाक्य: "server-side authorization every request." Interviewer खुश!
Ravindra Bagale's Tip – हिंदी
💡 Interview में Top 10 सिर्फ रट कर मत सुनाओ – एक example दो. "A01: user A URL में id बदलकर user B का invoice खोल लेता है – server authz check नहीं." Defence एक वाक्य: "server-side authorization every request." Interviewer खुश!
How do teams use the Top 10 without turning it into chaos?
Ghabru naka 😅 — these are the usual ones:
| Symptom | Likely cause | Fix |
|---|---|---|
| Endless findings, no progress | Treating every CWE equally | Rank by your data exposure and exploitability; fix A01/A02 hygiene first |
| “We scanned once” | One-time tool run | Add checks in CI + periodic review of cloud config and dependencies |
| Developers ignore the list | Too abstract | Map each category to one story in your app |
| Only testers own OWASP | Siloed security | Share ownership: design, code review, ops, detection |
| Chasing PoCs | Wrong goal for this guide | Stay on prevention and detection controls |
Try it at home
Pick any website you are building or studying. Write ten lines, one per category:
- A01 risk in this app:
- A02 risk in this app:
- … through A10 …
Keep each line one sentence. That is your personal threat sketch.
Learn it properly
Got it? OWASP Top 10:2025 is the top web-app risk list. Remember A01 access control, A02 misconfig, A03 supply chain first. Injection still matters. No attack PoC — defence checklist. Bookmark the official page.
समजलं का? OWASP Top 10:2025 ही वेब अनुप्रयोग जोखमींची मुख्य यादी. A01 प्रवेश नियंत्रण, A02 चुकीची रचना, A03 पुरवठा साखळी – ही तीन आधी लक्षात ठेवा. इंजेक्शन अजून महत्त्वाचे. हल्ल्याचे उदाहरण नाही – फक्त बचाव यादी. अधिकृत page चिन्हांकित करा.
समझ में आया? OWASP Top 10:2025 वेब अनुप्रयोग जोखिमों की मुख्य सूची है. A01 प्रवेश नियंत्रण, A02 गलत विन्यास, A03 आपूर्ति श्रृंखला – ये तीन पहले याद रखो. इंजेक्शन अभी भी ज़रूरी. हमले का उदाहरण नहीं – सिर्फ़ बचाव सूची. आधिकारिक page चिह्नित करो.
Frequently asked questions
What is the OWASP Top 10?
A widely used consensus list of critical web application security risks, updated for 2025 at owasp.org/Top10/2025/.
What is new or emphasised in 2025?
Software supply chain failures and mishandling of exceptional conditions are major themes; misconfiguration rose; broken access control remains first.
Is this an attack tutorial?
No. This guide is awareness and prevention for builders and defenders only.
Where does SQL injection sit in 2025?
Under A05 Injection. Prevent it with parameterized queries — see the SQL injection prevention guide.
How should a small team use the list?
Map each item to one risk in your app and fix high-exposure issues first instead of chasing every scanner finding equally.
Where are the deeper lessons on this site?
Cyber Security Part 11 — OWASP Top 10 web vulnerabilities.