Improper Neutralization of Special Elements in Output Used by a Downstream Component in Flowise - CVE-2026-70477
Published: July 30, 2026
Vulnerability identifier: #VU140058
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70477
CWE-ID: CWE-74
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper input sanitization in the run method of the CSV_Agents class when constructing an LLM prompt from untrusted data and executing LLM-generated Python code. A remote attacker can send a crafted prompt injection payload to cause the LLM to produce malicious Python code and execute arbitrary code.
Exploitation requires a chatflow using the CSV Agent node, and the generated Python code is executed in an unsandboxed pyodide environment.
Affected software
Flowise
How to mitigate CVE-2026-70477
Install security update from vendor's website.
Flowise - update to 3.1.3