RCE in Flowiseai Flowise
CVE-2026-69255
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the CSVAgent in packages/components/nodes/agents/CSVAgent/CSVAgent.ts extracted attacker-controlled CSV data with file.split(',').pop() and interpolated it directly into executable Python as base64_string = "${base64String}" before calling Pyodide. The validatePythonCodeForDataFrame() denylist only checked later LLM-generated code and did not validate this initial code block. An authenticated attacker could inject a closing quote followed by Python code, use Pyodide's js bridge to load Node.js child_process, and execute arbitrary operating system commands as root in the Flowise container. This issue is fixed in version 3.1.3.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.006 · change: -0.001
Affected products
- Flowiseai Flowise — versions < 3.1.3
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-vmv7-4m6c-3cg5 (Exploit, Vendor Advisory)
- github.com/FlowiseAI/Flowise/pull/6499 (Patch, Issue Tracking)
- github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626c (Patch)
- github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3 (Patch, Release Notes)
Frequently asked questions
- What is CVE-2026-69255?
- CVE-2026-69255 is a high-severity vulnerability in Flowiseai Flowise, classified under Code Injection. CVSS score: 8.8/10. Published 2026-08-04.
- How severe is CVE-2026-69255?
- High severity. CVSS v3 base score is 8.8 out of 10.