cybersecurity SKILL.md skillA
cybersecurity from secondsky/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add secondsky/claude-skills/cybersecurity@git:20260719.3c38a7bPins git:20260719.3c38a7b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- secondsky/claude-skills
- Path
plugins/cybersecurity/skills/cybersecurity/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260719.3c38a7b, committed Jul 19, 2026
- First version recorded
- Jul 18, 2026
- Size
- 16,024 bytes
- Repository stars
- 247
- License
- MIT
OSS-only security for OWASP Top 10, pentest, vuln testing (XSS, SSRF, CSRF, business-logic, Host header), threat modeling (STRIDE, ATT&CK), Sigma rules, SAST, code audit, AI/LLM red-team, or replacing paid tools (Burp, Nessus, Splunk) with OSS.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cybersecurity ## Overview OSS-only unified cybersecurity skill: analyze, test, and harden software security using **exclusively open-source tooling**. Covers threat modeling, web-vulnerability testing (XSS, business logic, Host header, open redirect, forced browsing), SAST / code audit, AI/LLM-app security, and detection engineering (Sigma + MITRE ATT&CK). Paid tools (Burp Suite, Nessus, Splunk, CrowdStrike, SonarQube, DOM Invader, Hackvertor) appear only as "if you already have it" notes — never as the primary path. For the full paid→OSS swap table, SEE: `references/oss-tool-map.md`. This skill fills a gap in this repo: the 5 existing defensive plugins (`csrf-protection`, `xss-prevention`, `vulnerability-scanning`, `security-headers-configuration`, `defense-in-depth-validation`) tell you how to *fix* — this skill tells you how to *find, analyze, and threat-model*. ## When to use Use this skill whenever the user's task touches software security. Triggers include: - Web/API vulnerability testing (XSS, business logic, Host header, open redirect, forced browsing, SSRF, CSRF). - Code audit / SAST / secure-code review (any language). …
Read the whole file at its exact version.
How to install
mdr add secondsky/claude-skills/cybersecurity@sha256:d864d90820608098The line at the top of this page pins the label git:20260719.3c38a7b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_xdr4e34gelwi2me4)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 18, 2026 and Jul 19, 2026, about one every day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260719.3c38a7b latest | 2026-07-19 | 3c38a7b | 16,024 B | A | view · diff |
| git:20260718.efee8ac | 2026-07-18 | efee8ac | 15,401 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (16024 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
secondsky/claude-skills · 247 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xdr4e34gelwi2me4 GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/cybersecurity GET https://markdownregistry.com/api/v1/blob/d864d908206080986f90f2a6b4d8f76bc248ea3ea0d4ab1caf1e390eec6c3e4d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.