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Vulnerability details

CVE-2026-55176

Soft-Machine-io security

Soft Machine: Cross-tenant workspace API auth bypass via shared `CONTAINER_SHARED_SECRET` bearer token

CVSS 3.1
9.0Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.0Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
Soft-Machine-io security <= 0.2.247 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-09-30
Last updated
2026-10-02
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.28%
Probability of exploitation in 30 days
21.4%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-863
    Incorrect Authorization