auditing-idp-initiated-flow-trust SKILL.md skillA
auditing-idp-initiated-flow-trust from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/auditing-idp-initiated-flow-trust@git:20260903.19a7174Pins git:20260903.19a7174 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/auditing-idp-initiated-flow-trust/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260903.19a7174, committed Sep 3, 2026
- Size
- 10,982 bytes
- Repository stars
- 26
- License
- MIT
Audit identity-provider-initiated single sign-on for trust placed in an unsolicited assertion the application never asked for: an IdP-initiated SAML response the service provider accepts with no matching request so there is no request state to bind it to, an unsolicited assertion an attacker captures and replays or delivers to a victim to log them into an attacker-chosen account, a RelayState value trusted as a redirect target so it becomes an open redirect, an assertion with no or a too-wide…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Auditing IdP-initiated flow trust: an unsolicited login has no request to anchor it, so validate everything else In service-provider-initiated single sign-on the application starts the flow, so it has a request on file to bind the returning assertion to: a request id it can require the response to reference, and request state it can check. IdP-initiated single sign-on removes that anchor. Login begins at the identity provider and the application receives an assertion it never asked for, with no matching request, no InResponseTo to check, and no request state to compare against. Everything the request would have pinned down, that this response answers a login this browser started, must now be validated some other way, and often is not. An unsolicited assertion an attacker captures can be replayed, or delivered to a victim, to log a browser into an attacker-chosen account. A RelayState value trusted as a redirect target becomes an open redirect or drops the user into an attacker-controlled context after login. An assertion with no audience restriction, or one too wide, is accepted …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/auditing-idp-initiated-flow-trust@sha256:2841c3a88bbd59dcThe line at the top of this page pins the label git:20260903.19a7174, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_l3vemzvcn5pqxsp4)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 3, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10982 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
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_l3vemzvcn5pqxsp4 GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-idp-initiated-flow-trust GET https://markdownregistry.com/api/v1/blob/2841c3a88bbd59dceb6c97e129da42de1cc6500c61138df40e31120187b907f9
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.