S3Scanner vs CORStest: 2026 Comparison
S3Scanner is a free security scanning tool. CORStest is a free security scanning tool. Compare features, ratings, integrations, and community reviews side by side to find the best security scanning fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
DevOps teams and security engineers doing periodic S3 audits will find real value in S3Scanner's speed and specificity; it catches bucket policy misconfigurations and public access vectors that generic CSPM tools often miss in their first scan. The 3,022 GitHub stars reflect active maintenance and community trust from practitioners running it in production environments. Skip this if you need continuous monitoring and automated remediation across hundreds of buckets; S3Scanner is built for manual scans and one-off assessments, not real-time drift detection.
AppSec teams running frequent web application assessments will get the most from CORStest because it isolates CORS misconfigurations that slip past broader vulnerability scanners, and the free pricing means you can run it as often as you want without licensing friction. With 419 GitHub stars and active maintenance, it's trusted enough for inclusion in scanning pipelines where CORS-specific coverage matters. Skip this if your org needs a generalist scanner that also catches SQL injection, XSS, and authentication flaws in one tool; CORStest does one thing and won't replace your primary web application scanner.
