CVE-2026-46685

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/rustfs/rustfs/security/advisories/GHSA-x5xv-223c-8vm7
https://github.com/rustfs/rustfs/security/advisories/GHSA-x5xv-223c-8vm7

Configurations

No configuration.

History

No history.

Information

Published : 2026-05-28 19:16

Updated : 2026-06-17 10:53

NVD link : CVE-2026-46685

Mitre link : CVE-2026-46685

CVE.ORG link : CVE-2026-46685

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

CWE-346

Origin Validation Error

CWE-942

Permissive Cross-domain Security Policy with Untrusted Domains

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