{"id":"CVE-2026-55176","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55176","generatedAt":"2026-10-28T00:18:47.047Z","title":"The existing per-workspace token check (workspaceTokenMatches) protects the user-facing per-workspace token path, but the shared-secret bearer path bypasses it entirely.","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.","published":"2026-09-30T17:16:47.000Z","lastModified":"2026-10-02T17:17:06.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-863"],"affected":[],"epss":{"score":0.00288,"percentile":0.21204,"date":"2026-10-26","history":[{"date":"2026-10-01","score":0.00317,"percentile":0.22338}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-30T17:16:47.000Z","detail":{"score":"9.0","severity":"CRITICAL","publishedAt":"2026-09-30T17:16:46.630Z"},"summary":"New CVE, critical severity (CVSS 9.0)."}],"references":[{"url":"https://github.com/Soft-Machine-io/security/security/advisories/GHSA-63gh-vp9f-vxhj","source":"security-advisories@github.com"},{"url":"https://github.com/Soft-Machine-io/security/security/advisories/GHSA-63gh-vp9f-vxhj","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55176","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}