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.

The following products are affected by CVE-2026-40937 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-40937.

URL	Resource
https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.94
https://github.com/rustfs/rustfs/security/advisories/GHSA-pfcq-4gjr-6gjm