Scan any website for real security risks, right from your browser.

The Defenso Chrome extension checks any page you visit for exposed secrets, weak security headers, insecure cookies and API risks — then browses behind your login to reveal the authenticated attack surface a public scan can never see.

  • Runs locally — your browsing stays on your machine
  • Evidence-based findings, no hallucinated verdicts
  • Free to install, no account needed to start
  • Syncs into your Defenso pentest & monitoring
Add to Chrome → See pricing
Defenso Chrome extension side panel scanning a website for security issues

What the extension checks

Every check is evidence-based — the extension shows you what it found and how to fix it, not a vague grade.

Exposed secrets API keys, tokens and credentials leaked in page source, inline scripts or network calls.
Security headers Missing or weak CSP, HSTS, X-Frame-Options, Referrer-Policy and more, graded against best practice.
Insecure cookies Session cookies without Secure, HttpOnly or SameSite — the ones that get stolen.
CORS & CSP gaps Over-permissive cross-origin rules and content-security holes that widen your attack surface.
API & endpoint risks Endpoints the page talks to, flagged for auth and exposure issues an external scan would miss.
Authenticated surface Browse behind your login and the extension maps pages and APIs a public pentest cannot reach.

How it works

1
Install and pin
Add the extension to Chrome and pin it to your toolbar. No account needed to run your first scan.
2
Open any site, click the icon
The side panel runs a live scan of the current page and lists every finding with a fix.
3
Connect for the full picture
Sign in to tie scans to your Defenso sites, run authenticated pentests, and sync findings into one report with your monitoring and repo scans.

Why a browser extension, not just a scanner

A public scanner only sees what an anonymous visitor sees. The most serious risks in a modern app live behind the login — the admin pages, the internal APIs, the dashboards your users reach after they authenticate. An external pentest cannot get there.

The Defenso extension scans from inside your own authenticated session. As you browse your app normally, it maps the real attack surface — the pages and endpoints that actually matter — and checks each one for exposed secrets, weak headers and insecure handling. It runs locally, so your browsing never leaves your machine; only the findings you choose to sync reach your dashboard.

Free shows you what is wrong. A Defenso plan unlocks deeper authenticated discovery, repo secret scans, AI fix analysis and the remediation for your highest-severity findings.

Frequently asked questions.

Everything people ask before they start. Still unsure? We are one message away.

Yes. Installing the Defenso security scanner and running scans is completely free, with no account needed to start. A Defenso plan unlocks deeper authenticated discovery, repo secret scans, AI fix analysis and the remediation for your most severe findings.

No. Scans run locally in your browser. Only the findings you explicitly choose to sync are sent to your Defenso dashboard.

An online scanner only sees the public, anonymous view of a site. This extension scans from inside your authenticated session, revealing the pages and APIs behind your login that a public scan can never reach.

Chrome and Chromium-based browsers (Edge, Brave, Arc). It is a standard Manifest V3 extension.

No. It only scans when you open the panel and click scan on the current page. It does not run in the background or intercept your traffic.

Scan your first page in 30 seconds.

Free to install. No account needed to start.

Add to Chrome → See pricing