# S4E — Security For Everyone

> S4E is a cybersecurity platform offering 11,000+ free vulnerability scanning tools, CVE-specific scanners, automated security playbooks, real-time threat alerts (Spark), and an enterprise CTEM platform. Most tools require no account.

## Quick facts

- 11,000+ security micro-services and scanners
- 40,000+ users worldwide
- 50M+ scans completed
- 190+ countries reached
- 20,000+ security professionals
- 300,000+ verified assets
- 22 fully free scanners (no account required)
- CVE-level precision — many tools map to specific CVE identifiers
- Export results as PDF, CSV, HTML, or video
- Supports domains, subdomains, and IPv4 addresses

## Free Security Tools

The tools directory at [s4e.io/tools](https://s4e.io/tools) lists all available free scanners.
Each tool has a dedicated detail page with description, technical explanation, solution advice, and a scan form.

Categories:
- **Web Vulnerability Scanners** — SQL Injection, XSS, LFI/RFI, SSRF, CRLF, Command Injection, CSRF, XXE, SSTI, Path Traversal
- **Reconnaissance** — Subdomain Finder, HTTP Methods, DNS TXT/MX, SSL/TLS, WAF Detection, Technology Detection, Panel Scanner, CORS, CSP, HSTS
- **Compliance** — PCI-DSS 6.4.3, PCI-DSS 11.6.1, Client-side PCI Security, GDPR Cookies
- **Authentication** — Default Login, User Enumeration, JWT Misconfiguration, OAuth Misconfiguration, WordPress User Enum
- **Network** — Open Port Scanner, SMTP Relay, Exposed Database Scanner
- **CVE Scanners** — CVE-2026-21484, CVE-2026-33439, CVE-2025-55182, CVE-2025-29927, Log4Shell, Spring4Shell, ProxyLogon, Zerologon, Drupalgeddon2, and hundreds more

## Platform Features

- [Opservant Agent](https://s4e.io/platform) — AI-powered continuous threat exposure management (CTEM)
- [Spark Alerts](https://s4e.io/platform#spark) — Real-time vulnerability notifications via Email and Slack (<60s detection)
- [Security Playbooks](https://s4e.io/platform#playbooks) — Automated multi-step scan chains (PCI-DSS, ISO 27001, pentest, recon)
- [Chrome Extension](https://chromewebstore.google.com/detail/s4e-continuous-threat-exp/poklckfkkeebomnafifkjddabdapipkb) — Live vulnerability reports on every site you browse

## Key pages

- [Home](https://s4e.io/) — Overview, free scan, stats
- [Free Tools Directory](https://s4e.io/tools) — Full searchable list of all scanners
- [Platform](https://s4e.io/platform) — Enterprise CTEM platform details
- [Pricing](https://s4e.io/pricing) — Plans: Everyone (free), Expert, Elite
- [AI in S4E](https://s4e.io/ai) — How AI powers the platform

## Individual tool pages

Every tool is accessible at: `https://s4e.io/tools/{tool-slug}`

Examples:
- [SQL Injection Scanner](https://s4e.io/tools/sql-injection-scanner)
- [XSS Scanner](https://s4e.io/tools/xss-scanner)
- [Subdomain Finder](https://s4e.io/tools/subdomain-finder)
- [CVE-2026-21484 Scanner](https://s4e.io/tools/cve-2026-21484-scanner)
- [Log4Shell Scanner](https://s4e.io/tools/log4shell-scanner)

## Severity levels

- **Critical** — Immediate exploitation risk, unauthenticated RCE, auth bypass
- **High** — Significant risk, exploitable with low effort
- **Medium** — Exploitable under certain conditions
- **Low** — Limited impact, informational
- **Info** — Configuration or reconnaissance data, no direct exploit

## Access model

- **For Everyone** — Scans anyone can run on any domain (recon, CVE checks)
- **Asset Owners** — Scans requiring proof of domain ownership (vuln scanners, auth tests)

## Contact and company

- Website: https://s4e.io
- Company: S4E Ltd
- Mission: Security for everyone — making enterprise-grade security tools accessible to all