CVE-2026-40937
RustFS: Missing admin authorization on notification target endpoints allows unauthenticated configuration of event webhooks
Impact
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-alpha.94, all four notification target admin API endpoints in `rustfs/src/admin/handlers/event.rs` use a `check_permissions` helper that validates authentication only (access key + session token), without performing any admin-action authorization via `validate_admin_request`. Every other admin handler in the codebase correctly calls `validate_admin_request` with a specific `AdminAction`. This is the only admin handler file that skips authorization. A non-admin user can overwrite a shared admin-defined notification target by name, causing subsequent bucket events to be delivered to an attacker-controlled endpoint. This enables cross-user event interception and audit evasion. 1.0.0-alpha.94 contains a patch.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | rustfs | <= 0.0.2 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Rustfs | Rustfs | Version 1.0.0 |