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CVE-2026-34156

Nocobase remote code execution

9.9 CRITICALPublic exploitEPSS 6.79%
  1. Published31 Mar 2026

Description

NocoBase is an AI-powered no-code/low-code platform for building business applications and enterprise solutions. Prior to version 2.0.28, NocoBase's Workflow Script Node executes user-supplied JavaScript inside a Node.js vm sandbox with a custom require allowlist (controlled by WORKFLOW_SCRIPT_MODULES env var). However, the console object passed into the sandbox context exposes host-realm WritableWorkerStdio stream objects via console._stdout and console._stderr. An authenticated attacker can traverse the prototype chain to escape the sandbox and achieve Remote Code Execution as root. This issue has been patched in version 2.0.28.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Nocobase< 2.0.28

Remediation

Fixed in
Nocobase≥ 2.0.28

References

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Frequently asked

Is CVE-2026-34156 being actively exploited?

CVE-2026-34156 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 6.79%.

How severe is CVE-2026-34156?

CVE-2026-34156 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 6.79% probability of exploitation.

Which products are affected by CVE-2026-34156?

Affected products include Nocobase.

How do I fix CVE-2026-34156?

Upgrade affected software to a fixed version, for example Nocobase 2.0.28 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34156 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.