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CVE-2026-46685— RustFS: Reflective CORS with credentials on S3 listener; unauthenticated license metadata endpoint on console

Quick assessment

Affected
rustfs rustfs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rustfs是RustFS开源的一个高性能对象存储系统。 RustFS 1.0.0-beta.2之前版本存在安全漏洞，该漏洞源于当RUSTFS_CORS_ALLOWED_ORIGINS未设置时，ConditionalCorsLayer会反射请求Origin值并设置宽松的跨域策略，可能导致浏览器在受害者具有凭据时发出跨域请求并读取响应。

AI Predicted 8.1 Difficulty: Easy EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs < 1.0.0-beta.2 affected
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I. Basic Information for CVE-2026-46685

Vulnerability Information
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Vulnerability Title
RustFS: Reflective CORS with credentials on S3 listener; unauthenticated license metadata endpoint on console
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
rustfs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rustfs是RustFS开源的一个高性能对象存储系统。 RustFS 1.0.0-beta.2之前版本存在安全漏洞，该漏洞源于当RUSTFS_CORS_ALLOWED_ORIGINS未设置时，ConditionalCorsLayer会反射请求Origin值并设置宽松的跨域策略，可能导致浏览器在受害者具有凭据时发出跨域请求并读取响应。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustfs rustfs < 1.0.0-beta.2 -

II. Public POCs for CVE-2026-46685

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III. Intelligence Information for CVE-2026-46685

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Vendor Advisories for CVE-2026-46685 (1)

Same Patch Batch · rustfs · 2026-05-28 · 7 CVEs total

CVE-2026-45039 9.8 CRITICAL RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer i
CVE-2026-45044 RustFS: Authentication bypass in /profile/cpu and /profile/memory allows unauthenticated a
CVE-2026-45042 RustFS: UploadPartCopy Does Not Enforce Destination Bucket Policy on Copy Source
CVE-2026-45040 RustFS: Sensitive Information Leakage (SessionToken and SecretAccessKey) in RustFS Logs [D
CVE-2026-45041 RustFS: Hard-coded RSA private key in license verifier permits arbitrary license forgery
CVE-2026-47136 RustFS: Unauthenticated RustFS console license endpoint exposes license metadata

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-306

V. Comments for CVE-2026-46685

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