CVE-2026-44426

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

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

shellhub-io · shellhub

CVSS v3.1 GITHUB

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

0.43% chance of exploitation in the next 30 days, 36th percentile

Published

2026-05-13

Updated

2026-05-14

Proof-of-concept exploits (1)

• advisories/GHSA-vwx9-7qcf-gg7f

Security advisories

• shellhub-io/shellhub/security/advisories/GHSA-vwx9-7qcf-gg7f

References

• CVE Record
• NVD entry