Auth bypass in Rustfs
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 o…
Vulnerability class: Broken Access Control
EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
Affected products
- Rustfs — versions < 1.0.0-alpha.94
Weakness classification (CWE)
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)
Frequently asked questions
- What is CVE-2026-40937?
- CVE-2026-40937 is a high-severity vulnerability in Rustfs, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-04-22.
- How severe is CVE-2026-40937?
- High severity. CVSS v3 base score is 8.3 out of 10.