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CVE-2026-77368— SeaweedFS: Authenticated Cross-Prefix IDOR in Filer TUS Handler Enables Arbitrary Write to Tenant-Forbidden Paths

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 4.39版本至4.40之前版本存在授权问题漏洞，该漏洞源于对已有上传会话的HEAD、PATCH和DELETE操作缺少JWT允许前缀验证，可能导致低权限租户劫持其他租户的上传会话，向禁止路径写入内容，或删除和读取其他租户的上传会话。

CVSS 7.6 · High EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
seaweedfs seaweedfs >= 4.39, < 4.40 affected
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I. Basic Information for CVE-2026-77368

Vulnerability Information
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Vulnerability Title
SeaweedFS: Authenticated Cross-Prefix IDOR in Filer TUS Handler Enables Arbitrary Write to Tenant-Forbidden Paths
Source: CVE Program / CVE List V5
Vulnerability Description
SeaweedFS is a distributed storage system for files and blobs. In version 4.39, the filer's TUS resumable-upload handler checks JWT allowed_prefixes scoping only when a session is created, letting a low-privilege tenant hijack another tenant's upload session to write content to filer paths their own token forbids. The HEAD, PATCH, and DELETE verbs that act on an existing session by its id never verify that the session's stored target path falls within the caller's allowed prefixes, so a tenant who obtains another upload's session identifier can PATCH attacker bytes into it and, on completion, have the file land at the victim's out-of-scope path. The same token can also DELETE other tenants' sessions and HEAD them to read upload progress and size, defeating the JWT prefix isolation. This vulnerability only affects deployments that configure filer JWT signing and have TUS uploads enabled. 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:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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 4.39版本至4.40之前版本存在授权问题漏洞，该漏洞源于对已有上传会话的HEAD、PATCH和DELETE操作缺少JWT允许前缀验证，可能导致低权限租户劫持其他租户的上传会话，向禁止路径写入内容，或删除和读取其他租户的上传会话。
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 >= 4.39, < 4.40 -

II. Public POCs for CVE-2026-77368

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III. Intelligence Information for CVE-2026-77368

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Patches & Fixes for CVE-2026-77368 (1)

Vendor Advisories for CVE-2026-77368 (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-2026-77317 8.1 HIGH SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite
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-639

V. Comments for CVE-2026-77368

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