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live triage1,287 proven
HIGHbroken access control✓ proven

Order readable as another user

GET /api/orders/4012 → 200 OK

CRITssrf✓ proven

Webhook fetches cloud metadata

url=169.254.169.254 → 200

HIGHbroken auth✓ proven

Admin API answers with no session

GET /api/admin/users → 200

HIGHauth bypass✓ proven

Reset token never expires

reused 9-day-old token → 200

For teams building with AI tools. Muster tests what they ship.

▹Cursor✳Claude Code❯Codexv0v0♥LovableRReplit

Muster's agents don't just scan.
They're paid to find real exploits.

Real vulnerabilities discovered through top bug-bounty programs.

Shopify
Airbnbview case study →Uberview case study →MetaMaskview case study →
View all case studies →

findings via public bug-bounty programs · not affiliated with or endorsed by these companies

Actionable and proven exploits, with the fix.

Every finding is replayed and proven: a real request, a real response, a real consequence. If Muster can't find a real exploit, it doesn't send you noise.

muster found✓ provenHIGH

broken access control

A normal user changed the order ID in the URL and read another customer's invoice: name, email, and amount.

GET /api/orders/4012 → 200 OK

fix

Check the record belongs to the logged-in user before returning it.

muster found✓ provenCRITICAL

leaked secret

Your Stripe secret key was sitting in the browser JS bundle. Anyone in dev-tools can charge cards.

main.js:3841 sk_live_51M…

fix

Move it server-side and rotate the key now.

muster found✓ provenHIGH

broken auth

The admin dashboard answered API calls with no session. The UI just hid the button.

GET /api/admin/users (no session) → 200

fix

Enforce the role check on the server route, not just the UI.

muster found✓ provenHIGH

sql injection

A payload in the search box made the database hand back every user in the table.

?q=' OR 1=1 -- → 12,904 rows

fix

Use parameterized queries. Never build SQL from raw input.

muster found✓ provenMEDIUM

idor

Any customer's invoice PDF was downloadable just by guessing the file id.

GET /files/inv_2231.pdf → 200 OK

fix

Authorize file access per user. Don't trust the URL.

muster found✓ provenCRITICAL

ssrf

A webhook URL field let us make the server fetch its own cloud metadata endpoint.

url=169.254.169.254/latest → 200

fix

Block internal IPs and allow-list outbound hosts.

muster found✓ provenHIGH

auth bypass

A password-reset token never expired. A 9-day-old link still logged us straight in.

reused 9-day-old reset token → 200

fix

Expire reset tokens and make them single-use.

muster found✓ provenHIGH

exposed backup

A public storage bucket held a full database dump, including hashed passwords.

GET /backups/db-2026-07.sql → 200

fix

Make buckets private and deny public listing.

muster found✓ provenHIGH

broken access control

A normal user changed the order ID in the URL and read another customer's invoice: name, email, and amount.

GET /api/orders/4012 → 200 OK

fix

Check the record belongs to the logged-in user before returning it.

muster found✓ provenCRITICAL

leaked secret

Your Stripe secret key was sitting in the browser JS bundle. Anyone in dev-tools can charge cards.

main.js:3841 sk_live_51M…

fix

Move it server-side and rotate the key now.

muster found✓ provenHIGH

broken auth

The admin dashboard answered API calls with no session. The UI just hid the button.

GET /api/admin/users (no session) → 200

fix

Enforce the role check on the server route, not just the UI.

muster found✓ provenHIGH

sql injection

A payload in the search box made the database hand back every user in the table.

?q=' OR 1=1 -- → 12,904 rows

fix

Use parameterized queries. Never build SQL from raw input.

muster found✓ provenMEDIUM

idor

Any customer's invoice PDF was downloadable just by guessing the file id.

GET /files/inv_2231.pdf → 200 OK

fix

Authorize file access per user. Don't trust the URL.

muster found✓ provenCRITICAL

ssrf

A webhook URL field let us make the server fetch its own cloud metadata endpoint.

url=169.254.169.254/latest → 200

fix

Block internal IPs and allow-list outbound hosts.

muster found✓ provenHIGH

auth bypass

A password-reset token never expired. A 9-day-old link still logged us straight in.

reused 9-day-old reset token → 200

fix

Expire reset tokens and make them single-use.

muster found✓ provenHIGH

exposed backup

A public storage bucket held a full database dump, including hashed passwords.

GET /backups/db-2026-07.sql → 200

fix

Make buckets private and deny public listing.

Mustered in minutes.

No agent to install. No pentest to schedule.
Connect Muster and watch it work.

01

Connect in 60 seconds

Paste your app's URL and optionally link your repo or cloud resources. Muster maps everything an attacker can reach.

app.muster.security/setup

your app url

https://app.acme.comConnect
mapping attack surface
✓Web appacme.com
✓APIapi.acme.com
✓Repogithub.com/acme/app
✓Dependencies214 packages
✓CloudAWS · 3 accounts
02

Watch the agents attack

Muster's AI swarms your app like real attackers, chaining auth bypass, IDOR, and injection at machine speed.

app.muster.security/run
6 agents activeexploits found 3
✓ EXPLOITGET /api/orders/4012another user's invoice
→ testingPOST /login × 500 (credential stuffing)
✓ EXPLOITGET /admin/users (no session)200 OK
✓ EXPLOIT?q=' OR 1=1 --12,904 rows
→ testingGET /files/inv_2231.pdf
✓ EXPLOITurl=169.254.169.254/latestcloud metadata
✓ EXPLOITreset-token replay (9 days old)logged in
→ testingGET /api/users/{id}/cards
✓ EXPLOITGET /api/orders/4012another user's invoice
→ testingPOST /login × 500 (credential stuffing)
✓ EXPLOITGET /admin/users (no session)200 OK
✓ EXPLOIT?q=' OR 1=1 --12,904 rows
→ testingGET /files/inv_2231.pdf
✓ EXPLOITurl=169.254.169.254/latestcloud metadata
✓ EXPLOITreset-token replay (9 days old)logged in
→ testingGET /api/users/{id}/cards
03

Get the proof, and the fix

Each exploit comes with proof and a one-line fix. Ship it, hit re-test, and watch it turn green.

app.muster.security/findings
HIGHOrder readable as another user✓ proven

GET /api/orders/4012 → 200 OK · belongs to user #12

fix Verify order.userId === session.userId before returning.

re-testing the fix
✓ verified fixed · holds on every deploy
Start free pen test →

integrations

Integrates with your workflow.

Muster rides your existing pipeline and tests every deployment.

⎇GitHub

Connect a repo in one click.

▶GitHub Actions

Attack on every push, right in CI.

▲Vercel

Test every preview deploy automatically.

◆GitLab

Same coverage for GitLab pipelines.

#Slack

New exploits land in your channel.

›_CLI / CI

Wire Muster into any pipeline.

what founders say

Built for people who ship.

“We move fast and handle sensitive government data. Muster found an access-control gap our scanners missed and handed us the exact fix. It's like having a pentester on call.”
SFSteven FoxCo-Founder, HelloGov
“In fintech, “you might be vulnerable” isn't good enough. Muster proved exactly what an attacker could reach and gave us the fix before it ever shipped.”
JNJohn NajarianCo-Founder, Market Rebellion
“We ship a lot of code, much of it AI-assisted. Muster catches the exact bugs that slip through, with proof, not a 200-page report nobody reads.”
RKRussell KommerFounder, eSoftware Associates

standing watch

Always on duty.

Every deploy can open a new hole. Muster re-attacks on every push and every night, and alerts you the moment something breaks. Not at your next audit. The moment it happens.

mstr · watchlivetracking · 06threat · 01

how fast · how it stays safe

Questions, answered.

+How fast do I get results?

The moment you connect an app, the agents start attacking. Most teams see their first proven vulnerabilities in about 10 minutes, and a full first report the same day. No sales call, no card.

+Will attacking my app break it or corrupt data?

No. Muster is non-destructive by default: scoped, rate-limited, read-only where it can be, and it never runs data-changing or destructive payloads. It behaves like a careful attacker, not a wrecking ball.

+Is it safe to point at production?

Yes, and you stay in control. You authorize every target and confirm you own it, runs are scoped and rate-limited, and you can point Muster at staging first if you prefer. Nothing is hidden: every finding includes the exact request the agent sent.

+Do you store my source code?

Code is analyzed, not retained. Secrets stay server-side and never appear in a report. We keep the findings and the proof, not your codebase.

+Do I need a security team to use it?

No. Every finding is written in plain English: what an attacker did, what it exposes, and the one change that closes it. If Muster can't find a real exploit, it doesn't send you noise.

+What does Muster actually test?

The whole shipped surface: broken access control and IDOR, auth bypass, leaked secrets and keys, injection, vulnerable dependencies, cloud misconfig, and the business-logic flaws AI-generated code fumbles most.

Ship fast. Sleep at night.

Connect in minutes. Your first exploit report lands tonight.

Start free pen test →See pricing

free · 1 app · no card · first findings in ~10 minutes