S4E is a cybersecurity company founded in 2021 that provides vulnerability scanning and detection solutions for individuals and businesses. The company operates a platform that performs automated security scans to identify vulnerabilities in web applications, systems, and digital assets. Their service includes scanners for detecting SQL injection vulnerabilities, CVE-specific threats, and other security weaknesses across domains, subdomains, and IP addresses.

The platform offers both single scans and continuous monitoring capabilities, with scan intervals ranging from days to weeks depending on the vulnerability type. Users can scan their digital assets to identify critical, high, and medium-level security issues. The company has processed over 2 million scans globally and serves more than 30,000 users worldwide as of 2025.

S4E's approach focuses on making cybersecurity accessible and understandable for users regardless of technical expertise or budget constraints. The company received recognition from Google in 2022 for identifying a security vulnerability in Google Chrome and secured its first investment in 2024. Their scanning tools cover various vulnerability types including SQL injection, unauthorized access, and known CVEs affecting popular software systems and content management platforms.

The company operates with a team that includes security researchers, developers, and operations staff. Their platform is available through a subscription model with trial options, targeting asset owners who need to protect their web applications and infrastructure from common security threats.