Sekost is a French cybersecurity company that provides remote audit and vulnerability assessment services for small and medium-sized businesses. The company's platform starts with a domain name or IP address to map external exposure, detect critical vulnerabilities, and deliver actionable remediation plans. Their service portfolio includes three main offerings: Flash Cyber (a free assessment), Diagnostic Cyber, and Check-up Cyber, all designed to be non-intrusive and require no software installation. The company performs external scanning to identify all services accessible from outside the organization's network. Their reports are designed for non-technical audiences, particularly business leaders, presenting findings in visual formats with prioritized recommendations based on criticality and impact. The platform operates entirely remotely without requiring internal system access or disrupting normal operations. Sekost targets organizations without dedicated security teams or extensive technical resources, including small businesses, municipalities, and various organizations. They also operate a partner program that enables IT service providers and consultants to integrate Sekost's audit capabilities into their own service offerings. Founded by ethical hackers and based in Brittany, France, the company emphasizes its independence and French sovereignty. In September 2025, Sekost was acquired by YesWeHack, a Bug Bounty and vulnerability management platform, marking YesWeHack's first external growth operation.