CVE-2026-39360: medium-severity vulnerability in rustfs
RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket object exfiltration
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.2%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
rustfs · rustfsRelated CVEs — rustfs
In the same product, most dangerous first.
CVE-2025-68926CRITICALRustFS has a gRPC Hardcoded Token Authentication BypassEPSS 31.9%CVE-2025-68705HIGHRustFS Path Traversal VulnerabilityEPSS 7.3%CVE-2026-27822CRITICALRust has Critical Stored XSS in Preview Modal, leading to Administrative Account TakeoverEPSS 5.1%CVE-2026-22782LOWRustFS RPC signature verification logs shared secretEPSS 0.5%CVE-2026-73284HIGHRustFS: AddServiceAccount Handler Allows Creation of Root-Parent Service AccountsEPSS 0.5%CVE-2026-73285HIGHRustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untaggedEPSS 0.5%