ShellHub has cross-tenant IDOR in `GET /api/namespaces/:tenant` via API Key bypasses membership check — CVE-2026-44426

Summary

## Summary `GET /api/namespaces/:tenant` returns the full namespace object — including the members list (user IDs, e-mails, roles), settings, and device counts — to any caller authenticated by an **API Key**, for any tenant, regardless of the API Key's own tenant scope. The handler conditionally skips the membership check when the user ID (`X-ID`) is absent, which is exactly the case for API Key authentication. ##…

Product

go: github.com/shellhub-io/shellhub

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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