unboundcompute/security-agent-skills · skills/auditing-webhook-authenticity-and-callback-trust/SKILL.md

auditing-webhook-authenticity-and-callback-trust skillA

auditing-webhook-authenticity-and-callback-trust is agent-read markdown (skill) from unboundcompute/security-agent-skills: Audit both directions of webhook trust: an inbound handler that acts on a payload without proving it authentic, and an outbound fetch of a caller-supplied URL that reaches internal targets. Covers inbound handlers with no signature check, a signature compared in non-constant time, a signature computed over a re-serialized body instead of the exact raw bytes, a verification result that is computed but never enforced, and no timestamp or replay defense; and outbound callback or fetch URLs validate.

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 unboundcompute/security-agent-skills/auditing-webhook-authenticity-and-callback-trust@git:20260821.57dfaf1
Exact content
mdr add unboundcompute/security-agent-skills/auditing-webhook-authenticity-and-callback-trust@sha256:2ea27fb5cabddf79

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_kpu4dbxmyrukqkmu.svg)](https://markdownregistry.com/a/art_kpu4dbxmyrukqkmu)

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Versions

versioncommittedcommitsizeaudit
git:20260821.57dfaf1 latest2026-08-21 57dfaf1 10,003 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (10003 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

GitHub

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_kpu4dbxmyrukqkmu
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-webhook-authenticity-and-callback-trust
GET https://markdownregistry.com/api/v1/blob/2ea27fb5cabddf798ac3d2ca9de8b0180278e1dbd02339ee49ef75a4bca89909

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