CVE-2026-44426Public exploitNetwork attack vector

Cross-tenant data disclosure via skipped membership check

Published May 13, 2026 · Updated May 13, 2026

Authorization bypass in ShellHub before 0.24.2 allows remote authenticated users to read another tenant's namespace data via an API key. The GET /api/namespaces/:tenant handler skips its membership check when X-ID is absent, while API-key authentication never supplies X-ID. An API key for one tenant and a target tenant UUID are sufficient to expose member IDs, e-mail addresses, roles, settings, and device counts across tenant boundaries.

CVSS severity6.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in ShellHub before 0.24.2 allows remote authenticated users to read another tenant's namespace data via an API key. The GET /api/namespaces/:tenant handler skips its membership check when X-ID is absent, while API-key authentication never supplies X-ID. An API key for one tenant and a target tenant UUID are sufficient to expose member IDs, e-mail addresses, roles, settings, and device counts across tenant boundaries.

The record

CVE
CVE-2026-44426
Published
May 13, 2026
Updated
May 13, 2026
Vendor
ShellHub
Product
ShellHub
Classifications
CWE-639, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=< 0.24.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ShellHub · ShellHubversion=< 0.24.2

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

Public exploit references

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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