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CVE-2026-77298— SeaweedFS S3 OIDC Bearer authentication bypasses IAM role trust policy

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 4.40之前版本存在授权问题漏洞，该漏洞源于S3 API接受外部OIDC JWT并映射到IAM角色时未强制执行角色信任策略，导致联合用户可获取其未被允许的角色的S3访问权限，包括对象读取、写入和删除。

CVSS 8.7 · High EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
seaweedfs seaweedfs < 4.40 affected
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I. Basic Information for CVE-2026-77298

Vulnerability Information
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Vulnerability Title
SeaweedFS S3 OIDC Bearer authentication bypasses IAM role trust policy
Source: CVE Program / CVE List V5
Vulnerability Description
SeaweedFS is a distributed storage system for files and blobs. In versions 4.39 and earlier, the S3 API accepts an external OIDC JWT sent directly in the Authorization header and maps it to an IAM role without enforcing that role's trust policy, so a federated user can assume a role they are not permitted to hold. The standard STS AssumeRoleWithWebIdentity path rejects such a token when the role's trust policy does not trust the token's federated provider, but the direct S3 bearer path validates only the token itself and then authenticates as the mapped role and evaluates that role's attached S3 permissions. As a result, a valid OIDC user whose token would be denied the role through STS can obtain the role's S3 access, including object read, write, and delete, by presenting the raw OIDC JWT directly to the S3 API. This issue is fixed in version 4.40
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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 4.40之前版本存在授权问题漏洞，该漏洞源于S3 API接受外部OIDC JWT并映射到IAM角色时未强制执行角色信任策略，导致联合用户可获取其未被允许的角色的S3访问权限，包括对象读取、写入和删除。
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 < 4.40 -

II. Public POCs for CVE-2026-77298

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8132 chars
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III. Intelligence Information for CVE-2026-77298

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Patches & Fixes for CVE-2026-77298 (1)

Vendor Advisories for CVE-2026-77298 (1)

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

CVE-2026-77317 8.1 HIGH SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite
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-2026-77298

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