SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control

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SeaweedFS is a distributed storage system. Prior to 4.24, the filer registers the SeaweedIdentityAccessManagement gRPC service without mandatory authentication when jwt.filer_signing.key is unset, allowing any client that can reach the filer gRPC port to invoke CreateUser, CreateAccessKey, PutPolicy, and related IAM RPCs to mint credentials and gain S3 administrative control. This issue is fixed in versions 4.24.

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11 Aug 2026 14:23:22 UTC

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11 Aug 2026 14:46:46 UTC

Saved here

23 Oct 2026 15:48:27 UTC

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CVSS 3.1 · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SeaweedFS is a distributed storage system. Prior to 4.24, the filer registers the SeaweedIdentityAccessManagement gRPC service without mandatory authentication when jwt.filer_signing.key is unset, allowing any client that can reach the filer gRPC port to invoke CreateUser, CreateAccessKey, PutPolicy, and related IAM RPCs to mint credentials and gain S3 administrative control. This issue is fixed in versions 4.24.

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Aug 11, 2026, 2:23:22 PM (timezone not stated)

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Aug 11, 2026, 2:46:46 PM (timezone not stated)

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14 Nov 2026 03:06:19 UTC

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EUVD CVSS 3.1 · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SeaweedFS is a distributed storage system. Prior to 4.24, the filer registers the SeaweedIdentityAccessManagement gRPC service without mandatory authentication when jwt.filer_signing.key is unset, allowing any client that can reach the filer gRPC port to invoke CreateUser, CreateAccessKey, PutPolicy, and related IAM RPCs to mint credentials and gain S3 administrative control. This issue is fixed in versions 4.24.

Source published

11 Aug 2026 15:17:38 UTC

Source modified

9 Sep 2026 20:46:02 UTC

Saved here

25 Oct 2026 15:19:03 UTC

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CVSS 3.1 · [email protected] · Secondary · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

### Impact The filer registered the IAM gRPC service (`SeaweedIdentityAccessManagement`) with no authentication. Any client able to reach the filer gRPC port could invoke IAM RPCs — `CreateUser`, `CreateAccessKey`, `PutUserPolicy`, and related calls — to mint credentials and grant itself S3 administrative privileges. This fully compromises the confidentiality, integrity, and availability of stored objects. No credentials are required, and enabling the documented JWT signing keys does not close it: the IAM gRPC service was not gated by that mechanism. Even under mTLS, the listener-level `allowed_commonNames` ACL applies to the port rather than to individual RPCs, so any cluster mesh certificate could reach these administrative calls. ### Affected component - `weed/server/filer_server_handlers_iam_grpc.go` - `weed/command/filer.go` ### Patches Fixed in **4.24**. Every IAM RPC now requires a Bearer token signed with the filer admin signing key (`jwt.filer_signing.key`), and the service refuses to register when no signing key is configured — removing the unauthenticated default entirely. ### Workarounds Restrict the filer gRPC port to trusted hosts. Configure `jwt.filer_signing.key` in `security.toml` and upgrade to 4.24; operators that use the IAM RPCs must attach an admin-signed Bearer token on each call. ### References - Fixed by seaweedfs/seaweedfs#9442 (follow-ups: #9498, #9508, #9514, #9536) - Reported by Kadir Arslan (https://github.com/KadirArslan)

Source published

2 Sep 2026 14:51:58 UTC

Source modified

10 Sep 2026 15:26:01 UTC

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24 Oct 2026 13:19:41 UTC

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GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control in github.com/seaweedfs/seaweedfs

Source published

10 Sep 2026 14:48:42 UTC

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10 Sep 2026 15:26:01 UTC

Saved here

24 Oct 2026 13:19:41 UTC

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OSV · upstream source license applies

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