CVE-2026-46442

Description

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.

CVSS v3.1 Score

9.9

CRITICAL

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

EPSS — Exploit Prediction

0.0082

Probability of exploitation

0.53%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-94 CWE-94

Affected Products

Vendor	Product	Versions
flowiseai	flowise	< 3.1.2

References

Advisories & Patches

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2 https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2

Exploits

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2 https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9rvc-vf7m-pgm2

Other References

https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2

Frequently Asked Questions

What is CVE-2026-46442? +

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2. It has a CVSS v3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2026-46442? +

CVE-2026-46442 has a CVSS v3.1 score of 9.9 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0082, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-46442? +

CVE-2026-46442 affects products from flowiseai, specifically: flowise. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-46442? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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