Auth bypass in Rustfs

CVE-2025-68926

RustFS is a distributed object storage system built in Rust. In versions prior to 1.0.0-alpha.78, RustFS implements gRPC authentication using a hardcoded static token `"rustfs rpc"` that is publicly exposed in the source code repository, hardcoded on both client and server sides, non-configurable with no mechanism for token rotation, and universally valid across all RustFS deployments. Any attacker with network access to the gRPC port can authenticate using this publicly known token and execute privileged operations including data destruction, policy manipulation, and cluster configuration changes. Version 1.0.0-alpha.78 contains a fix for the issue.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.319 (98.2th percentile), scored .

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-68926: held from 0.314 to 0.319.

EPSS over last 30 days · oldest: 0.314 · newest: 0.319 · change: +0.005

Affected products

  • Rustfs — versions 1.0.0, < 1.0.0-alpha.78

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-68926?
CVE-2025-68926 is a critical-severity vulnerability in Rustfs, classified under Improper Authentication. CVSS score: 9.8/10. Published 2025-12-30.
How severe is CVE-2025-68926?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-68926 known to be exploited?
3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.