CVE-2026-55176Public exploit

Cross-tenant workspace access via unscoped shared secret

Published Sep 30, 2026 · Updated Sep 30, 2026

Authorization bypass in Soft Machine 0.2.247 and earlier allows remote authenticated users to read and overwrite peer workspaces via their APIs. In /app/server.js, verifyContainerAuth() and authenticateWorkspaceHttp() accept an app-wide bearer secret without checking that the caller belongs to the target workspace. Exploitation requires a paid workspace shell and network reachability to a peer workspace; the same secret also authorizes backup redirection and destructive restore.

CVSS severity9.0
Critical
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Soft Machine 0.2.247 and earlier allows remote authenticated users to read and overwrite peer workspaces via their APIs. In /app/server.js, verifyContainerAuth() and authenticateWorkspaceHttp() accept an app-wide bearer secret without checking that the caller belongs to the target workspace. Exploitation requires a paid workspace shell and network reachability to a peer workspace; the same secret also authorizes backup redirection and destructive restore.

The record

CVE
CVE-2026-55176
Published
Sep 30, 2026
Updated
Sep 30, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1078
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0GitHub_MCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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