# CVE-2026-40937

> Vulnerability · severity: **HIGH** (CVSS 8.3).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-40937
- **Published:** 2026-04-22
- **CVSS severity:** HIGH
- **CVSS base score:** 8.3
- **CWE codes:** CWE-862

## Affected products

- `rustfs:rustfs`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40937

## Citation

> AI Analytics. CVE-2026-40937. Retrieved 2026-07-10 from https://api.ai-analytics.org/cve/CVE-2026-40937. Derived from NIST NVD. Licensed CC0.

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