CVE-2026-70477: Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, a prompt injection sent to a chatflow using a CSV Agent node can cause the

unknownCVE-2026-70477

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, a prompt injection sent to a chatflow using a CSV Agent node can cause the LLM to respond with a malicious Python script that bypasses the blocklist validator and executes in an unsandboxed Pyodide environment. The specific flaw exists within the run method of the CSV_Agents class, where untrusted data is used to construct an LLM prompt and the resulting pythonCode is validated by validatePythonCodeForDataFrame before execution. An attacker can leverage this to execute arbitrary code in the context of the service account. This issue is fixed in 3.1.3.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-08-04
Last updated: 2026-08-05
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-70477

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-704770.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-70477	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalGHSA-5xvg-pmgg-3mxr: Flowise: CSV Agent Prompt Injection Remote Code Execution Vulnerabilityghsa

Recent advisories for Flowise is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-70636: Flowise through 3.1.4 contains an authentication bypass vulnerability that allows unauthentica…nvd · 2026-08-06
criticalCVE-2026-67622: Flowise through 3.1.4 contains an insecure direct object reference vulnerability in the OpenAI…nvd · 2026-08-06
highCVE-2026-67621: Flowise through 3.1.4 contains a missing authorization vulnerability that allows authenticated…nvd · 2026-08-06
high[NEW] [high] Flowise: Multiple vulnerabilitiescert-bund · 2026-08-05
unknownCVE-2026-70478: Flowise is a drag & drop user interface to build a customized large language model flow. Prior…nvd · 2026-08-04
unknownCVE-2026-70476: Flowise is a drag & drop user interface to build a customized large language model flow. Prior…nvd · 2026-08-04