Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-73285— RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untagged

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-alpha.64至1.0.0-rc.1之前版本存在授权问题漏洞，该漏洞源于crates/iam/src/sys.rs中通过RUSTFS_POLICY_PLUGIN_URL启用的外部OPA授权错误设置PreparedIamAuth.needs_existing_object_tag，导致maybe_merge_object_tag_conditions省略s3:ExistingObjectTag/*值，允许已认证用户绕过基

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs >= 1.0.0-alpha.64, < 1.0.0-rc.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-73285

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untagged
Source: CVE Program / CVE List V5
Vulnerability Description
RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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-alpha.64至1.0.0-rc.1之前版本存在授权问题漏洞，该漏洞源于crates/iam/src/sys.rs中通过RUSTFS_POLICY_PLUGIN_URL启用的外部OPA授权错误设置PreparedIamAuth.needs_existing_object_tag，导致maybe_merge_object_tag_conditions省略s3:ExistingObjectTag/*值，允许已认证用户绕过基
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-alpha.64, < 1.0.0-rc.1 -

II. Public POCs for CVE-2026-73285

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7392 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-73285

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-73285 (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-2026-73265 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-2026-73285

No comments yet

Leave a comment