Cloud Storage Security (CSS) is a cybersecurity company focused on securing data stored in cloud storage environments, primarily Amazon S3. Founded in 2020, the company offers two core products: Antivirus for Amazon S3 and DataDefender. Antivirus for Amazon S3 is an in-tenant, multi-engine malware scanning solution designed to detect and remediate malicious files stored in Amazon S3 buckets. It operates as a container-based deployment and is available through the AWS Marketplace, where it holds the distinction of being the most subscribed container listing. DataDefender is the company's Data Security Posture Management (DSPM) platform. It provides cloud storage inventory, data classification, activity monitoring, threat detection, and configuration checks. Together, the two products are designed to give organizations visibility and control over their cloud-stored data. CSS also offers GenAI Secure, a product targeted at organizations building generative AI applications. It scans ML model data and application outputs stored in Amazon S3 for malware and sensitive data before use, addressing risks introduced by third-party datasets in AI/ML pipelines. The company serves commercial, regulated, and public sector organizations globally, with customers on every continent except Antarctica. It reports over 1,000 subscriptions, more than 10 billion files scanned, and over 5 million pieces of malware detected. CSS emphasizes private, air-gapped deployment options to meet strict internal architecture and compliance requirements.