---
title: "CVE-2026-69253: Flowise Sandbox Escape to RCE"
url: https://erroneo.us/security/cve/CVE-2026-69253/
description: "CVE-2026-69253 (flowise (npm)): Flowise is a drag-and-drop user interface for building customized large language model (LLM) flows. Prior to version 3.1.3…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-04
date_modified: 2026-08-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-69253"
kev: false
cvss: 9
epss: 0.00664
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-69253: Flowise Sandbox Escape to RCE

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes flowise (npm) <= 3.1.2, fixed in 3.1.3 ; flowise-components (npm) <= 3.1.2, fixed in 3.1.3 . Check your lockfile, including transitive dependencies.

## What it is

Flowise is a drag-and-drop user interface for building customized large language model (LLM) flows. Prior to version 3.1.3, several custom-tool components — AgentAsTool, ChatflowTool, and ExecuteFlow — ran code in the in-process vm2 sandbox. To build that code, they inserted a user-controlled baseURL value straight into the JavaScript source, for example const url = "${baseURL}/..."; . The only check on baseURL was isValidURL , but a valid-looking URL can still contain characters that break out of a code string. An authenticated user could craft a baseURL that passed this check, closed the surrounding string, and injected their own JavaScript into the sandboxed script (code injection, CWE-94). The vm2 sandbox runs in the same Node.js process as Flowise and exposes risky dependencies. As a result, the injected code could escape the sandbox and run arbitrary code on the Flowise server as the Flowise process user. Exploitation only requires an authenticated session. The issue is fixed in version 3.1.3, which passes the URL to the sandbox as data instead of inserting it into code and adds stricter URL validation.

## Affected packages

- npm `flowise` <= 3.1.2 → fixed: 3.1.3
- npm `flowise-components` <= 3.1.2 → fixed: 3.1.3

## Affected products (CVE record)

- FlowiseAI Flowise: < 3.1.3

## Severity

- GitHub_M CVSS 4.0: 9 `CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`
- GitHub CVSS 4.0: 9.0 `CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.66% probability of exploitation activity in the next 30 days; percentile 51.

## Sources

- [GitHub Advisory GHSA-wg86-r78f-74mp](https://github.com/advisories/GHSA-wg86-r78f-74mp)
- [CVE.org record CVE-2026-69253](https://www.cve.org/CVERecord?id=CVE-2026-69253)
- [NVD entry CVE-2026-69253](https://nvd.nist.gov/vuln/detail/CVE-2026-69253)
- [github.com](https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-wg86-r78f-74mp)
- [github.com](https://github.com/FlowiseAI/Flowise/pull/6417)
- [github.com](https://github.com/FlowiseAI/Flowise/commit/3f257bdc8196082a178da7134a075824401b13b9)
- [github.com](https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3)

---
Source page: https://erroneo.us/security/cve/CVE-2026-69253/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt