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CVE-2026-72921— SeaweedFS: Filer JWT allowed_prefixes literal prefix match allows cross-tenant access to sibling paths

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filer服务器处理程序中的allowed_prefixes授权检查使用strings.HasPrefix对原始路径字符串进行前缀匹配，导致作用域为/tenant1的令牌也能授权/tenant1234等兄弟路径，可能允许攻击者利用有效的受限令牌进行跨租户读写。

CVSS 8.1 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
seaweedfs seaweedfs < 4.24 affected
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I. Basic Information for CVE-2026-72921

Vulnerability Information
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Vulnerability Title
SeaweedFS: Filer JWT allowed_prefixes literal prefix match allows cross-tenant access to sibling paths
Source: CVE Program / CVE List V5
Vulnerability Description
SeaweedFS is a distributed storage system. Prior to 4.24, the weed/server/filer_server_handlers.go allowed_prefixes authorization check used strings.HasPrefix on raw path strings, so a filer JWT scoped to /tenant1 also authorized sibling paths such as /tenant1234, /tenant1-old, and /tenant1backup, enabling cross-tenant reads and writes with a valid scoped token. This issue is fixed in version 4.24.
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
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filer服务器处理程序中的allowed_prefixes授权检查使用strings.HasPrefix对原始路径字符串进行前缀匹配，导致作用域为/tenant1的令牌也能授权/tenant1234等兄弟路径，可能允许攻击者利用有效的受限令牌进行跨租户读写。
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-2026-72921

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6372 chars
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-72921

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Patches & Fixes for CVE-2026-72921 (2)

Vendor Advisories for CVE-2026-72921 (1)

Vendor Pages for CVE-2026-72921 (1)

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

CVE-2026-72920 9.8 CRITICAL SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control
CVE-2026-73080 9.3 CRITICAL SeaweedFS: Unauthenticated SSRF with response read-back via VolumeServer.FetchAndWriteNeed

IV. Related Vulnerabilities

Same product: seaweedfs
Same vendor: seaweedfs
Same weakness: CWE-863

V. Comments for CVE-2026-72921

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