CVE-2026-55176
Tenable Plugin
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Threat Intelligence Pending
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Description
Soft Machine is a Virtual Machine–based agentic development environment / Cloud OS. In versions 0.2.247 and prior, two authentication helpers in /app/server.js — verifyContainerAuth() and authenticateWorkspaceHttp() — accept the global CONTAINER_SHARED_SECRET as a bearer token without verifying which workspace the caller belongs to. Because that secret is set identically on every container in the Fly app and is reachable from the user-facing process environment inside each workspace, any tenant can use it to authenticate to any other tenant's workspace API. The result is cross-workspace read, write, and destructive-restore primitives reachable from any paying customer's shell. The existing per-workspace token check (workspaceTokenMatches) protects the user-facing per-workspace token path, but the shared-secret bearer path bypasses it entirely. At time of publication, there are no publicly known patches.
Quick Facts
| CVE ID | CVE-2026-55176 |
| CVSS Score | 9.0 |
| Vector | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-09-30 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |