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CVE-2026-72920— SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control

Quick assessment

Affected
seaweedfs seaweedfs
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.

SeaweedFS是SeaweedFS团队开源的一款分布式网络存储文件系统。 SeaweedFS 4.24之前版本存在授权问题漏洞，该漏洞源于未对SeaweedIdentityAccessManagement gRPC服务进行强制身份验证，当jwt.filer_signing.key未设置时，任何可访问filer gRPC端口的客户端均可调用CreateUser、CreateAccessKey、PutPolicy及相关IAM RPC，从而生成凭证并获得S3管理控制权。

CVSS 9.8 · Critical EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
seaweedfs seaweedfs < 4.24 affected
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I. Basic Information for CVE-2026-72920

Vulnerability Information
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Vulnerability Title
SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control
Source: CVE Program / CVE List V5
Vulnerability Description
SeaweedFS is a distributed storage system. Prior to 4.24, the filer registers the SeaweedIdentityAccessManagement gRPC service without mandatory authentication when jwt.filer_signing.key is unset, allowing any client that can reach the filer gRPC port to invoke CreateUser, CreateAccessKey, PutPolicy, and related IAM RPCs to mint credentials and gain S3 administrative control. This issue is fixed in versions 4.24.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
SeaweedFS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SeaweedFS是SeaweedFS团队开源的一款分布式网络存储文件系统。 SeaweedFS 4.24之前版本存在授权问题漏洞，该漏洞源于未对SeaweedIdentityAccessManagement gRPC服务进行强制身份验证，当jwt.filer_signing.key未设置时，任何可访问filer gRPC端口的客户端均可调用CreateUser、CreateAccessKey、PutPolicy及相关IAM RPC，从而生成凭证并获得S3管理控制权。
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
seaweedfs seaweedfs < 4.24 -

II. Public POCs for CVE-2026-72920

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10159 chars
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III. Intelligence Information for CVE-2026-72920

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Patches & Fixes for CVE-2026-72920 (2)

Vendor Advisories for CVE-2026-72920 (1)

Vendor Pages for CVE-2026-72920 (1)

Same Patch Batch · seaweedfs · 2026-08-11 · 3 CVEs total

CVE-2026-73080 9.3 CRITICAL SeaweedFS: Unauthenticated SSRF with response read-back via VolumeServer.FetchAndWriteNeed
CVE-2026-72921 8.1 HIGH SeaweedFS: Filer JWT allowed_prefixes literal prefix match allows cross-tenant access to s

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-72920

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