dreadnode/capabilities · capabilities/web-security/skills/mcp-auth-exploitation/SKILL.md

mcp-auth-exploitation skillB

mcp-auth-exploitation is agent-read markdown (skill) from dreadnode/capabilities: Exploit MCP authorization flows — CIMD SSRF via client_manifest_uri/logo_uri/jwks_uri, Dynamic Client Registration abuse, token scope inflation in multi-agent chains, confused deputy attacks. Use when target exposes MCP authorization, OIDC Dynamic Client Registration (RFC 7591), or multi-agent token delegation..

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.

How to install

Latest version
mdr add dreadnode/capabilities/mcp-auth-exploitation@git:20260529.0ab6ab0
Exact content
mdr add dreadnode/capabilities/mcp-auth-exploitation@sha256:9300596c527d3da5

Pin 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.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_dzwo24ayif4zo7js.svg)](https://markdownregistry.com/a/art_dzwo24ayif4zo7js)

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Versions

versioncommittedcommitsizeaudit
git:20260529.0ab6ab0 latest2026-05-29 0ab6ab0 9,795 BB view · diff
git:20260529.8f6ea0e2026-05-29 8f6ea0e 10,256 BB view · diff
git:20260504.2a643742026-05-04 2a64374 10,185 BB view

Audit of the latest version

B  16 of 17 checks passed. Deterministic, no model, same answer every run.
  • fail: No link to a raw IP address (matched: http://169.254.169.254)
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9795 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 script tag

Source

GitHub

dreadnode/capabilities · 15 stars · license none · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_dzwo24ayif4zo7js
GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/mcp-auth-exploitation
GET https://markdownregistry.com/api/v1/blob/9300596c527d3da576f9fbc111071a32e473fdb859f2bdf05dc44e463cc6bb0a

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.