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
EPSS: 0.290 (98.0th percentile) — read the EPSS interpretation.
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.
Affected products
- Rustfs — versions 1.0.0, < 1.0.0-alpha.78
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
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.