unboundcompute/security-agent-skills · skills/auditing-webauthn-and-passkey-flows/SKILL.md

auditing-webauthn-and-passkey-flows skillA

auditing-webauthn-and-passkey-flows is agent-read markdown (skill) from unboundcompute/security-agent-skills: Audit the server side of passwordless authentication for ceremony-verification bugs that let an attacker-shaped response become an authenticated session. Covers a registration or authentication ceremony whose challenge is not bound to a server-issued single-use value, an origin or relying-party identifier that is never checked or checked by substring, a user-verification flag ignored when policy required it, attestation accepted when it was required, a signature counter regression that hides a c.

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-webauthn-and-passkey-flows@git:20260821.57dfaf1
Exact content
mdr add unboundcompute/security-agent-skills/auditing-webauthn-and-passkey-flows@sha256:2ffc7910341c2723

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_b2oq2se74totstu6.svg)](https://markdownregistry.com/a/art_b2oq2se74totstu6)

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Versions

versioncommittedcommitsizeaudit
git:20260821.57dfaf1 latest2026-08-21 57dfaf1 10,034 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 (10034 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_b2oq2se74totstu6
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-webauthn-and-passkey-flows
GET https://markdownregistry.com/api/v1/blob/2ffc7910341c27235f58b8c72e23dfe8c0de1c81052aaf64476bca6901cbee54

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