auditing-mobile-backend-and-firebase-exposure SKILL.md skillA
auditing-mobile-backend-and-firebase-exposure 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-mobile-backend-and-firebase-exposure@git:20260908.e3ae18aPins git:20260908.e3ae18a 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-mobile-backend-and-firebase-exposure/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260908.e3ae18a, committed Sep 8, 2026
- Size
- 10,000 bytes
- Repository stars
- 26
- License
- MIT
Audit the backend a mobile app talks to for authorization that lives only in the client, where a mobile-backend service, a hosted datastore, a storage bucket, or a cloud function trusts the app to enforce access and so lets any client read or write another user's data, call a privileged operation, or reach records it should not, because the service rules are permissive, the operation authorizes by client-set values, or the backend assumes only the genuine app calls it. Use when a mobile app…
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 mobile backend and Firebase exposure: when the server trusts the app to say no A mobile app usually talks to a hosted backend, a mobile-backend service, a cloud datastore, a storage bucket, or a set of cloud functions, and it is easy to build that backend as though the app were the only client. The app checks what the user may see and calls the backend accordingly, so the backend rules are left permissive because the app is trusted to enforce access. But the app is not the only client: anyone can take the app's credentials and endpoints and call the backend directly, skipping every check the app performs. When the backend authorizes by rules that are too broad, by values the client sets, or by the assumption that only the genuine app calls it, a direct request reads or writes another user's data, invokes a privileged operation, or reaches records the user should never see. The bug is authorization that lives in the client while the backend serves whoever asks. You audit these by calling the backend directly and checking whether the server, not the app, enforces access. ## When to use …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/auditing-mobile-backend-and-firebase-exposure@sha256:5f57ecb3227994aeThe line at the top of this page pins the label git:20260908.e3ae18a, 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_c5pipzv4swhhhy6h)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 8, 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 (10000 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_c5pipzv4swhhhy6h GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-mobile-backend-and-firebase-exposure GET https://markdownregistry.com/api/v1/blob/5f57ecb3227994aebf9e5f7055cdf65df8a9bf62a43b83a395d5ee9a509144b6
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.