What is CVE-2026-55189?

CVE-2026-55189 is a high-severity vulnerability in Rustfs, classified under Missing Authorization. CVSS score: 7.7/10. Published 2026-06-26.

How severe is CVE-2026-55189?

High severity. CVSS v3 base score is 7.7 out of 10.

Auth bypass in Rustfs

CVE-2026-55189

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers dispatch directly to the storage backend without ever calling the IAM aut…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Rustfs — versions >= 1.0.0-alpha.1, <= 1.0.0-beta.8

Weakness classification (CWE)

CWE-862 — Missing Authorization
CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55189?: CVE-2026-55189 is a high-severity vulnerability in Rustfs, classified under Missing Authorization. CVSS score: 7.7/10. Published 2026-06-26.
How severe is CVE-2026-55189?: High severity. CVSS v3 base score is 7.7 out of 10.