CVE-2026-40937

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.

• CWE-862

• https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94Product, Release Notes
• https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjmMitigation, Vendor Advisory

Published

Apr 22, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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