Individual skill

web-webauthn-software-authenticator

Register and authenticate against a WebAuthn/FIDO2 relying party using a self-built SOFTWARE authenticator (no hardware key) when the RP requests attestation "none" (or otherwise doesn't verify attestation trust). Load when: a login is "WebAuthn/passkey/ FIDO2", endpoints like /webauthn/register|auth/begin|finish, `navigator.credentials`, and you hold (or can leak) a registration invite/enrollment token. Authorized targets only.

skills/web/web-webauthn-software-authenticator/SKILL.md

Read pinned source

Source commit ee0e0c50d2f6d941a14b73dd85a2b470d0ab976e

What was checked

Matches the observed repository HEAD: Yes
Scanner rules are current: No
Repository scan complete: No
Skill scan complete: Yes
Observed behavior: Not checked yet
Last checked: Nov 7, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

Install this skill

Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

agent-skills Repository topic
ai-agents Repository topic
ai-security Repository topic
application-security Repository topic
blue-team Repository topic
bug-bounty Repository topic
claude-code Repository topic
codex Repository topic
detection-engineering Repository topic
gemini Repository topic
engineering Derived category

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

Browse files

SKILL.mdcore · 4,943 bytes

Read excerpt


# Forge a software WebAuthn authenticator (attestation: none)

## When it applies
- The app authenticates with **WebAuthn/FIDO2** (register + authenticate "ceremonies",
  `navigator.credentials.create/get`, client bundles calling
  `/register/begin`,`/register/finish`,`/auth/begin`,`/auth/finish`).
- `register/begin` returns creation options with **`"attestation":"none"`** (or the RP
  never validates the attestation certificate chain). None-attestation means the server
  does NOT check that a real hardware authenticator vouched for the key — so a key you
  generate in software is accepted.
- You can start registration: either registration is open, or you can **leak an
  invite/enrollment token** (see `tech-mongo-agg-facet-bypass` and NoSQL-injection notes).

## Why it works