CVE-2026-40937

The record

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

Related vulnerabilities

• GHSA-pfcq-4gjr-6gjm RustFS: Missing admin authorization on notification target endpoints allows… Same vulnerability
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• CVE-2026-39360 RustFS is a distributed object storage system built in Rust. Also affects rustfs
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• CVE-2026-27822 RustFS is a distributed object storage system built in Rust. Also affects rustfs
• CVE-2026-27607 RustFS is a distributed object storage system built in Rust. Also affects rustfs