offensive-api-security skillC
offensive-api-security is agent-read markdown (skill) from snailsploit/claude-red: Comprehensive API security testing methodology covering REST, gRPC, and WebSocket attack surfaces. Addresses the full OWASP API Security Top 10 2023 including BOLA/IDOR, broken authentication, excessive data exposure, rate limiting bypass, BFLA, mass assignment, SSRF, and security misconfiguration. Includes REST-specific attacks such as HTTP verb tampering, content-type switching, and parameter pollution. Covers gRPC exploitation through protobuf interception, reflection API enumeration, and met.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Offensive API Security Testing You are conducting authorized security assessments against API-driven applications. This skill covers REST, gRPC, and WebSocket attack surfaces with emphasis on the OWASP API Security Top 10 2023. Every technique assumes you have written authorization and a defined scope. Your goal is to identify vulnerabilities that allow unauthorized data access, privilege escalation, or service disruption through API-layer attacks. ## Quick Workflow 1. Map the API surface: collect OpenAPI/Swagger specs, gRPC reflection output, and WebSocket endpoints. 2. Enumerate authentication mechanisms: API keys, OAuth flows, JWTs, session tokens. 3. Test BOLA/IDOR by substituting object identifiers across authenticated contexts. 4. Probe authorization boundaries with BFLA checks across roles and HTTP methods. 5. Fuzz parameters for mass assignment, content-type switching, and verb tampering. 6. Assess rate limiting and resource consumption controls. 7. Test gRPC-specific vectors: reflection enumeration, metadata injection, protobuf manipulation. 8. Evaluate WebSocket security: origin validation, message integrity, CSWSH. …
Read the whole file at its exact version.
How to install
mdr add snailsploit/claude-red/offensive-api-security@git:20260825.1885f44mdr add snailsploit/claude-red/offensive-api-security@sha256:c76a14cfc2e427d6Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_4rg5742uxb76gemz)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260825.1885f44 latest | 2026-08-25 | 1885f44 | 19,822 B | C | view · diff |
| git:20260825.8cffe5d | 2026-08-25 | 8cffe5d | 24,137 B | C | view |
Audit of the latest version
- fail: No link to a raw IP address (matched: http://169.254.169.254)
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (19822 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
Source
snailsploit/claude-red · 6,831 stars · license MIT · pushed 2026-09-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4rg5742uxb76gemz GET https://markdownregistry.com/api/v1/resolve?ref=snailsploit/claude-red/offensive-api-security GET https://markdownregistry.com/api/v1/blob/c76a14cfc2e427d64b769445de5d6ef233c10188c2aeee1ce3dc1631b8b1cd23
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