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CVE-2026-73286— RustF: Request headers can populate server-derived IAM condition keys, letting a caller satisfy identity-based policy conditions

Quick assessment

Affected
rustfs rustfs
Exploitation
Public or AI PoC available; prioritize validation
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get_condition_values函数将攻击者控制的请求头合并到服务器派生的条件键中，可能允许已认证的调用者满足基于身份的策略条件。

CVSS 8.1 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs < 1.0.0-beta.12 affected
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I. Basic Information for CVE-2026-73286

Vulnerability Information
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Vulnerability Title
RustF: Request headers can populate server-derived IAM condition keys, letting a caller satisfy identity-based policy conditions
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 get_condition_values folds attacker-controlled request headers from HeaderMap into server-derived userid, username, principaltype, groups, versionid, signatureversion, jwt:, and ldap: condition keys, allowing authenticated callers to satisfy identity-based policy conditions. 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:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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get_condition_values函数将攻击者控制的请求头合并到服务器派生的条件键中，可能允许已认证的调用者满足基于身份的策略条件。
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-2026-73286

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: injected "userid" header satisfied IAM policy condition key aws:userid, retrieved PROOF_cdadfa484aaa26c9
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 9561 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-73286

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Vendor Advisories for CVE-2026-73286 (2)

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-2026-73289 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-2026-73287 5.4 MEDIUM RustFS: FTPS MKD bypasses IAM CreateBucket authorization
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-863

V. Comments for CVE-2026-73286

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