CVE-2026-72920Network attack vectorHinoki check available

Unauthenticated S3 administration via exposed IAM RPCs

Published Aug 11, 2026 · Updated Aug 11, 2026

Missing authentication in the SeaweedFS filer before 4.24 allows remote attackers to gain S3 administrative control through IAM gRPC. The filer registers SeaweedIdentityAccessManagement without an authentication interceptor, exposing CreateUser, CreateAccessKey, and PutUserPolicy. Any client that can reach the filer gRPC port can mint credentials and administer stored objects; configured JWT keys or mesh certificates do not constrain these RPCs.

CVSS severity9.8
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Missing authentication in the SeaweedFS filer before 4.24 allows remote attackers to gain S3 administrative control through IAM gRPC. The filer registers SeaweedIdentityAccessManagement without an authentication interceptor, exposing CreateUser, CreateAccessKey, and PutUserPolicy. Any client that can reach the filer gRPC port can mint credentials and administer stored objects; configured JWT keys or mesh certificates do not constrain these RPCs.

The record

CVE
CVE-2026-72920
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
SeaweedFS
Product
SeaweedFS
Classifications
CWE-306, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SeaweedFS · SeaweedFSversion=< 4.24

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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