What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-06-17
• Weakness: CWE-639

Description

ShellHub is a centralized SSH gateway. Prior to 0.24.2, 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. This vulnerability is fixed in 0.24.2.

Affected products

• shellhub-io shellhub: before 0.24.2 — fixed in 0.24.2

How to fix

Upgrade to a fixed version: shellhub-io shellhub 0.24.2. Check the vendor advisory for mitigations.

References

• https://github.com/shellhub-io/shellhub/security/advisories/GHSA-vwx9-7qcf-gg7f
• https://github.com/shellhub-io/shellhub/security/advisories/GHSA-vwx9-7qcf-gg7f

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