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CVE-2026-77317— SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite

Quick assessment

Affected
seaweedfs seaweedfs
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.

SeaweedFS是SeaweedFS团队开源的一款分布式网络存储文件系统。 SeaweedFS 3.88版本至4.39版本存在授权问题漏洞，该漏洞源于SFTP服务器在检查路径权限时仅进行字符串前缀比较，未检查路径组件边界，可能导致低权限SFTP用户越权读取或覆盖其他租户文件。

CVSS 8.1 · High EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
seaweedfs seaweedfs >= 3.88, < 4.40 affected
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I. Basic Information for CVE-2026-77317

Vulnerability Information
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Vulnerability Title
SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite
Source: CVE Program / CVE List V5
Vulnerability Description
SeaweedFS is a distributed storage system for files and blobs. In versions from 3.88 through 4.39, the SFTP server evaluates configured path permissions with a literal string-prefix comparison, so a user scoped to a path is also granted the same access to any sibling path whose name merely begins with the same characters. A user granted access to /tenants/alice therefore also matches /tenants/alice-archive, /tenants/alice2, and similar siblings, because the check does not require a path-component boundary. An authenticated low-privilege SFTP user with a root home directory and narrow path permissions can thereby cross the configured ACL boundary to read another tenant's files, and to overwrite them if granted write, all through the documented SFTP service with its own valid credentials. This issue is fixed in version 4.40.
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 3.88版本至4.39版本存在授权问题漏洞，该漏洞源于SFTP服务器在检查路径权限时仅进行字符串前缀比较，未检查路径组件边界，可能导致低权限SFTP用户越权读取或覆盖其他租户文件。
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
seaweedfs seaweedfs >= 3.88, < 4.40 -

II. Public POCs for CVE-2026-77317

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III. Intelligence Information for CVE-2026-77317

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Patches & Fixes for CVE-2026-77317 (1)

Vendor Advisories for CVE-2026-77317 (1)

Same Patch Batch · seaweedfs · 2026-08-26 · 4 CVEs total

CVE-2026-77298 8.7 HIGH SeaweedFS S3 OIDC Bearer authentication bypasses IAM role trust policy
CVE-2026-77368 7.6 HIGH SeaweedFS: Authenticated Cross-Prefix IDOR in Filer TUS Handler Enables Arbitrary Write to
CVE-2026-77611 7.1 HIGH SeaweedFS: Authenticated S3 object-scope bypass in PutObjectAcl allows overwriting a diffe

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-77317

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