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/cybersecurity

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.

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claude-skills
241183 skills42 agents62 commands2 MCP

Claude Code

$ npx -y skills add secondsky/claude-skills --skill cybersecurity --agent claude-code

SKILL.md

cybersecurity.SKILL.md
name: cybersecurity
description: 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.
license: MIT
metadata:
  keywords:
    - owasp
    - pentest
    - vulnerability
    - xss
    - ssrf
    - csrf
    - business-logic
    - host-header
    - open-redirect
    - forced-browsing
    - threat-modeling
    - stride
    - pasta
    - vast
    - mitre-att-and-ck
    - sigma
    - sast
    - code-audit
    - dalfox
    - owasp-zap
    - ffuf
    - nuclei
    - interactsh
    - mitmproxy
    - semgrep
    - detection-engineering
    - incident-response
    - ai-security
    - llm-red-team
    - prompt-injection

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).
  • Threat modeling (STRIDE / PASTA / VAST), MITRE ATT&CK mapping, attack-surface analysis.
  • Incident analysis and response reasoning (ransomware, breach, anomaly triage).
  • Detection engineering: Sigma rules, MITRE ATT&CK coverage / gap analysis, ATT&CK Navigator layers.
  • AI / LLM application security (prompt injection, OWASP LLM Top 10, agent safety, "vibe-coded" app audits).
  • Compliance work (OWASP, CVE, GDPR / SOC2 / ISO27001).
  • Replacing a paid security tool with an OSS alternative.
  • Mapping a finding to a remediation pattern (cross-references the 5 defensive plugins).

**When NOT to use:**

  • IT/infrastructure-only security operations (patching servers, firewall rules — see ORCHESTRATION exclusions).
  • Malware analysis / reverse engineering of binaries (out of scope).
  • Smart-contract / blockchain security beyond agent-safety review (Solana-specific skills excluded).
  • Anything involving the user's permanently-excluded topics: malware, virus, supabase, openclaw, linux hardening, hardware spoofing, firewall config.

Execution model — router + dispatcher (NOT an executor)

**This skill is a ROUTER and DISPATCHER.** The main context stays a thin orchestrator (~this file). For every reference doc below, the orchestrator **dispatches a dedicated sub-agent** with the user's task and the matching reference doc as its briefing. The main context **never** inlines a reference doc's body.

Sub-agent dispatch contract

For each delegated task, the orchestrator:

1. **(If live-target)** Confirms the authorization gate has been acked for this target this session — see §"Authorization gate" below. 2. **Dispatches a sub-agent** with:

  • **task:** the user's verbatim task plus any collected context (code, URLs, target scope, ack state).
  • **briefing:** the contents of the matching `references/<doc>.md`.
  • **model:** the **highest reasoning tier available** — preferred `gpt-5.6 sol` (pinned); fallback `claude-opus-4.x max` or `opus 5 max`. Pin the model + reasoning effort explicitly at dispatch (e.g. `model: "claude-opus-5-max"`, `reasoning_effort: "max"`). If neither tier is available, use the highest available tier and note the degradation in the dispatch log. Deep adversarial security reasoning needs the high tier — do not leave it to defaults.
  • **tools:** the reference doc names which OSS tools the sub-agent may invoke.
  • **return:** the reference doc's `## Sub-agent return contract` defines the output shape.

3. **Relays the sub-agent's output to the user verbatim** — do not summarize away severity, evidence, or remediation detail. 4. **(If live-target)** Does not auto-dispatch follow-up live-target tasks without re-confirming scope.

Fan-out for "audit everything" requests

When the user asks for broad coverage ("audit this codebase for security issues", "test this app for everything"), the orchestrator dispatches multiple sub-agents **in parallel** (single message, multiple dispatch tool calls) per `superpowers:dispatching-parallel-agents`:

  • code-audit sub-agent (`references/aradotso-code-audit.md`)
  • XSS sub-agent (`references/testing-xss.md`) — only if a web app
  • business-logic sub-agent (`references/testing-business-logic.md`) — only if a stateful app
  • AI-app sub-agent (`references/aradotso-ai-security.md`) — only if an LLM app
  • (etc.)

The authorization gate fires **once up front** for the batch (covering all live-target sub-agents in the batch), not per sub-agent. The orchestrator merges all sub-agent outputs into a single report.

What stays in the main context (never delegated)

| Stays inline | Why | |---|---| | Routing decision (which reference matches this task) | Cheap; needs full task context. | | Authorization gate (`references/authorization-disclaimer.md`) | **Safety-critical.** The gate must fire *before* any sub-agent dispatch for live-target tasks. Delegating it would create a TOCTOU window where a sub-agent runs against a real host before ack is confirmed. | | Ack-state tracking (per-session, per-target-sco

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@secondsky
Ships withclaude-skills

145 production-ready skills for Claude Code CLI 🔌 Platform / Harness Support These plugins ship as Claude Code marketplace plugins (.claude-plugin/ manifests) and Codex CLI plugins (.codex-plugin/ manifests).

241183 skills42 agents2 MCP
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Questions about cybersecurity.

Which coding agents can use cybersecurity?
cybersecurity installs in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI, using each agent's flag shown on this page. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.