Cloud Storage Security (CSS) vs Obsidian Security - SaaS Pre-Exfiltration: Side-by-Side Comparison (2026)

Short answer

Mid-market and enterprise teams storing sensitive data across AWS S3 and related services need Cloud Storage Security because its malware scanning actually runs inside your VPC, eliminating the risk of exfiltrating data to third-party scanning infrastructure. Fifteen-minute CloudFormation deployment and native integration with GuardDuty, Security Hub, and EventBridge mean you're detecting threats in your storage layer without rebuilding your monitoring stack. Skip this if you need a multi-cloud solution; CSS is AWS-native only, which is exactly why it works so well for shops committed to that ecosystem. Mid-market and enterprise security teams drowning in SaaS alert noise need Obsidian Security - SaaS Pre-Exfiltration because its ML-based behavior baselining actually reduces false positives instead of just tuning thresholds. The vendor maps detections to MITRE ATT&CK and includes specific coverage for helpdesk social engineering and SSPR abuse, attacks that generic SIEM rules consistently miss. Skip this if your team lacks the bandwidth to integrate with SIEM or SOAR; Obsidian's value compounds when alerts feed into incident response workflows, not when they sit in a separate console.