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CVE-2026-73287— RustFS: FTPS MKD bypasses IAM CreateBucket authorization

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组织开源的一款网络存储文件系统。 RustFS 1.0.0-beta.12之前版本存在授权问题漏洞，该漏洞源于未对S3Action::CreateBucket操作进行授权验证即调用storage.create_bucket，可能导致已认证的FTPS用户绕过权限限制创建桶。

CVSS 5.4 · Medium EPSS 0.37% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs < 1.0.0-beta.12 affected
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I. Basic Information for CVE-2026-73287

Vulnerability Information
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Vulnerability Title
RustFS: FTPS MKD bypasses IAM CreateBucket authorization
Source: CVE Program / CVE List V5
Vulnerability Description
RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.12, RustFS handles FTPS MKD in FtpsDriver::mkd in crates/protocols/src/ftps/driver.rs by calling storage.create_bucket without authorize_operation for S3Action::CreateBucket, allowing authenticated FTPS users denied s3:CreateBucket to create buckets. This issue is fixed in version 1.0.0-beta.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
RustFS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RustFS是RustFS组织开源的一款网络存储文件系统。 RustFS 1.0.0-beta.12之前版本存在授权问题漏洞，该漏洞源于未对S3Action::CreateBucket操作进行授权验证即调用storage.create_bucket，可能导致已认证的FTPS用户绕过权限限制创建桶。
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.12 -

II. Public POCs for CVE-2026-73287

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III. Intelligence Information for CVE-2026-73287

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Vendor Advisories for CVE-2026-73287 (1)

Same Patch Batch · rustfs · 2026-08-12 · 8 CVEs total

CVE-2026-73284 8.8 HIGH RustFS: AddServiceAccount Handler Allows Creation of Root-Parent Service Accounts
CVE-2026-73286 8.1 HIGH RustF: Request headers can populate server-derived IAM condition keys, letting a caller sa
CVE-2026-73289 8.1 HIGH RustFS: ForAllValues/ForAnyValue negated string conditions are transposed, inverting IAM a
CVE-2026-73285 7.5 HIGH RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authoriza
CVE-2026-73265 6.5 MEDIUM RustFS: Version-specific object reads authorize the non-version action
CVE-2026-73288 6.1 MEDIUM RustFS: Object Lock (WORM) protections are treated as absent when bucket metadata cannot b
CVE-2026-73290 5.3 MEDIUM RustFS: Anonymous ListObjectVersions bypasses RestrictPublicBuckets through the ListBucket

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-862

V. Comments for CVE-2026-73287

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