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RustFS is a distributed object storage system built in Rust. Prior to alpha.90, RustFS contains a missing authorization check in the multipart copy path (UploadPartCopy). A low-privileged user who cannot read objects from a victim bucket can still exfiltrate victim objects by copying them into an attacker-controlled multipart upload and completing the upload. This breaks tenant isolation in multi-user / multi-tenant deployments. This vulnerability is fixed in alpha.90.
Use CWE-862, Rustfs vendor hub and Rustfs product page to widen CVE-2026-39360 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-68926, CVE-2026-27822 and CVE-2025-68705 for nearby disclosures in the same product family.