Vulnerability Description
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, when RUSTFS_CORS_ALLOWED_ORIGINS is unset, the RustFS S3 listener's ConditionalCorsLayer reflects any request Origin value back as Access-Control-Allow-Origin and also sets Access-Control-Allow-Credentials: true and Access-Control-Allow-Headers: * on responses, including preflight responses and error responses. This creates a permissive cross-domain policy with untrusted origins. A browser visiting an attacker-controlled page can issue credentialed cross-origin requests to a reachable RustFS deployment and read the response when the victim browser has ambient credentials for the RustFS origin, such as saved HTTP Basic Auth credentials, reverse-proxy SSO cookies, or TLS client certificates. This vulnerability is fixed in 1.0.0-beta.2.
Related Weaknesses (CWE)
References
- https://github.com/rustfs/rustfs/security/advisories/GHSA-x5xv-223c-8vm7
- https://github.com/rustfs/rustfs/security/advisories/GHSA-x5xv-223c-8vm7
FAQ
What is CVE-2026-46685?
CVE-2026-46685 is a documented vulnerability. RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, when RUSTFS_CORS_ALLOWED_ORIGINS is unset, the RustFS S3 listener's ConditionalCorsLayer reflects any request Origin...
How severe is CVE-2026-46685?
CVSS scoring is not yet available for CVE-2026-46685. Check NVD for updates.
Is there a patch for CVE-2026-46685?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.