Vulnerability · Published Apr 22, 2026 · Assigned by GitHub_M

CVE-2026-40937RustFS missing admin authorization on notification target endpoints, which allows unauthenticated configuration of event webhooks

High 8.3

In plain English

A high-severity missing authorization in rustfs from rustfs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.3%top 78.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
rustfs	rustfs	< 1.0.0-alpha.94

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

References

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