Executive brief
ShellHub, a centralized SSH gateway for remote device management, contains a flaw that allows an authenticated user to view SSH session details belonging to other organizations (tenants). An attacker could use this to see who is logged into which devices, their IP addresses, and connection timestamps. This information could be used to plan further attacks or monitor the activities of other users on the platform.
Technical details
A cross-tenant Insecure Direct Object Reference (IDOR) exists in the `GET /api/sessions/:uid` endpoint of ShellHub. The root cause is located in `api/services/session.go`, where the `GetSession` function resolves session objects by UID without verifying if the session belongs to the requester's tenant namespace. An authenticated attacker with a valid session UID (which may be obtained via logs or other IDOR vulnerabilities) can retrieve full session objects including SSH usernames, device UIDs, remote IPs, and timestamps. The vulnerability is patched in version 0.24.2.
Affected products
- ShellHub ShellHub <= 0.24.1
Timeline
- 2026-04-29: disclosed
- 2026-05-06: advisory
- 2026-05-06: patched: Version 0.24.2 released