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TI-2026-54097 Aliases CVE-2026-77611

Incorrect authorization in seaweedfs

Priority MEDIUM 64CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler authorizes the request against the requested nested key but then writes the updated entry back to the bucket root rather than the key's actual parent directory, so an ACL change on allowed/protected.txt is instead applied to protected.txt at the bucket root. Because the update carries the full entry rather than only ACL metadata, an existing target object is overwritten with the content, metadata, owner information, and ACL of the scoped object, bypassing the object-level action scoping configured through the static S3 identity file. This issue is fixed in version 4.40.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00384 32nd percentileScored 2026-11-07
Fix Fixed seaweedfs (seaweedfs): 4.40

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
seaweedfsseaweedfsbefore 4.404.40Patch availableCNA
  • seaweedfs Vendorseaweedfs Affected before 4.40 Fixed in 4.40 Patch available CNA

Remediation

  • Fix · CNA seaweedfs (seaweedfs) Fixed in 4.40

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-77611

References

Other 2

  • TI-2026-39686 SeaweedFS: Path traversal in the S3 and Iceberg REST gateways allows cross-bucket access CVSS 4.0HIGH 7.8
  • TI-2026-53965 SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite CVSS 3.1HIGH 8.1
  • TI-2024-26879 seaweedfs v3.68 was discovered to contain a SQL injection vulnerability via the component… CVSS 3.1MEDIUM 6.5
  • TI-2026-42003 SeaweedFS < 4.34 - Cross-Bucket Object Deletion via DeleteObjects Request-Body Keys CVSS 4.0HIGH 7.2
  • TI-2026-74336 Hard-coded SSH host key in SeaweedFS SFTP Helm chart CVSS 4.0HIGH 7.0
  • TI-2026-51136 SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control CVSS 3.1CRITICAL 9.8
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences