Imported from DarkShadow-codex/ZeroDayX (
skills/owasp-top-10-testing/SKILL.md). Install upstream withnpx skills add DarkShadow-codex/ZeroDayX --skill owasp-top-10-testing. Copyright stays with the author.
Test against the OWASP Top 10
The OWASP Top 10 is a taxonomy of risk categories, not a test suite — "OWASP Top 10 testing" means exercising each category against the real application and reporting what's actually exploitable. ZeroDay's agents do the exploitation; this skill covers running it category-by-category and reporting coverage honestly.
Use the current edition: OWASP Top 10:2025 (8th installment, superseding 2021). Ask the user before targeting an older edition — some compliance checklists still reference 2021, and a report labelled with the wrong edition is misleading. Key differences from 2021: SSRF is folded into A01, A03 Software Supply Chain Failures expands the old "Vulnerable and Outdated Components", and A10 Mishandling of Exceptional Conditions is new; A02 Security Misconfiguration moved 5→2.
Install, LLM setup, and the managed-cloud alternative: penetration-testing-with-zeroday. For a run with no Docker and no LLM key, the same binary drives the managed platform: zeroday cloud login, then zeroday cloud scans start ... (details in managed-pentesting-with-zeroday).
What is and is not testable by an agent
Be straight with the user about this — claiming a clean sweep of all ten is misleading.
| Category (2025) | Coverage |
|---|---|
| A01 Broken Access Control (incl. SSRF) | Strong — cross-user/tenant access, privilege escalation, IDOR, and SSRF (including blind, via out-of-band callbacks) are all exploit-validated. Needs two accounts plus a privileged one to prove the authorization half. |
| A02 Security Misconfiguration | Strong — debug endpoints, verbose errors, permissive CORS, missing hardening, default credentials, exposed admin surfaces. |
| A03 Software Supply Chain Failures | Partial — version fingerprinting, and vulnerable/outdated dependency review when source is supplied. Build-system and distribution-infrastructure compromise (the broader half of this category) is out of scope for a runtime scan — pair with SCA plus build-provenance controls. |
| A04 Cryptographic Failures | Partial — transport config, unencrypted data in transit, secrets and tokens leaked in responses. At-rest crypto and key management need source or infra review. |
| A05 Injection | Strong — SQL/NoSQL/command/template injection and XSS, exploit-validated. |
| A06 Insecure Design | Partial — business-logic abuse (price/quantity tampering, workflow skipping, race conditions) is found where reachable; design intent still needs human review and threat modelling. |
| A07 Authentication Failures | Strong — auth bypass, weak session/token handling, password-reset and MFA flaws. |
| A08 Software or Data Integrity Failures | Partial — insecure deserialization and unsigned-update paths where reachable; CI/CD trust boundaries are not runtime-testable. |
| A09 Security Logging & Alerting Failures | Not testable from outside — requires reviewing the logging and alerting pipeline. State this rather than reporting it as passed. |
| A10 Mishandling of Exceptional Conditions | Partial — agents actively probe error handling and fail-open behavior (malformed input, forced errors, race and timeout conditions) and report what leaks or bypasses a control; exhaustive coverage of internal error paths needs source review. |
For APIs, run the same exercise against the OWASP API Security Top 10 (2023) — API1 BOLA, API3 Broken Object Property Level Authorization (2019's excessive data exposure + mass assignment merged), API5 broken function-level authorization — using the api-security-testing skill.
Run it
Maximum category coverage comes from giving the agents both the source and a running instance, plus credentials at two privilege levels:
zeroday -n \
-t https://github.com/org/app \
-t https://staging.example.com \
--scan-mode deep --max-budget 30 \
--instruction "OWASP Top 10:2025 assessment. Cover every category systematically and map each finding to its 2025 category id.
Accounts: userA@example.com/<pw> (org 1), userB@example.com/<pw> (org 2), admin@example.com/<pw>.
Prioritise A01 (cross-org access, privilege escalation, SSRF), A02, A05, A07, A10.
Out of scope: /billing/*, outbound email."--scan-mode deepmatters here: systematically walking ten categories is not a quick scan.- Without a second account, A01 results are structurally incomplete — say so in the report rather than leaving it implied.
- Need an auditor-facing PDF? Run it through the managed platform and pull the technical report (managed-pentesting-with-zeroday).
Report honestly
From zeroday_runs/<run>/, group vulnerabilities/*.md by category and state, per category: what was attempted, what was proven, and what could not be assessed (A09 always; A03/A04/A06/A08/A10 partially). Label the report with the edition used. Verify each PoC yourself before it goes in front of the user.
A 0 exit code means nothing exploitable was proven in what was analyzed — check run.json status and cost against --max-budget; a budget-capped run is not a completed assessment.
Then fix and re-test
Remediate with fix-security-vulnerabilities-with-zeroday and re-run to prove each exploit is closed. For ongoing coverage as the app changes, gate pull requests using ci-security-scanning-with-zeroday.