CVE-2026-40937
HIGHDescription
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.
Is your site exposed to CVE-2026-40937?
Run a free security scan — no signup, results in seconds.
CVSS v3.1 Score
EPSS — Exploit Prediction
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
Weakness Type (CWE)
Affected Products
| Vendor | Product |
|---|---|
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
| rustfs | rustfs |
References
Advisories & Patches
Other References
Frequently Asked Questions
What is CVE-2026-40937? +
How severe is CVE-2026-40937? +
What products are affected by CVE-2026-40937? +
How do I check if I'm vulnerable to CVE-2026-40937? +
Related Vulnerabilities
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, the `load_customer_info` action in `POST /conversation/ajax` …
GLPI is a free asset and IT management software package. Starting in version 0.78 and prior to versions 10.0.25 and …
In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make …
SOPlanning does not enforce authorization for backup functionalities. An unauthenticated attacker can directly query backup-related endpoints and retrieve backup archives …
A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does …
An authorization bypass in MISP’s EventsController::importModule() allowed authenticated users or read-only API keys with event view access to persist data …