Vulnerability in Flowiseai Flowise
CVE-2026-70470
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise validatePythonCodeForDataFrame in packages/components/src/pythonCodeValidator.ts can be bypassed with Unicode homoglyph identifiers, allowing arbitrary Python execution inside Pyodide and full OS command execution on the Flowise host via Pyodide js module interop. The validator gates pyodide.runPythonAsync in packages/components/nodes/agents/CSVAgent/CSVAgent.ts and packages/components/nodes/agents/AirtableAgent/AirtableAgent.ts with an ASCII word-boundary blacklist. JavaScript regex word boundaries are ASCII-only, while Python 3 NFKC-normalizes identifiers at parse time, so homoglyph forms such as __cl𝐚ss__, __subcl𝐚sses__, __b𝐚se__, and __b𝐮iltins__ bypass the blacklist and are parsed as their ASCII equivalents. This issue is fixed in version 3.1.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Flowiseai Flowise — versions < 3.1.3
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-52fh-8v99-63c2 (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-2026-70470?
- CVE-2026-70470 is a critical-severity vulnerability in Flowiseai Flowise, classified under Incomplete List of Disallowed Inputs. CVSS score: 9.8/10. Published 2026-08-04.
- How severe is CVE-2026-70470?
- Critical severity. CVSS v3 base score is 9.8 out of 10.