Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck

CVE-2026-73486Flowise before 3.1.3 Code Injection via CSV Agent customReadCSV

Critical 9.0

In plain English

A critical-severity code injection in Flowise from FlowiseAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 4.0)9.0Critical

Exploit odds (30 days)0.7%top 48.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Flowise before 3.1.3 contains a code injection vulnerability in the CSV Agent node's customReadCSV parameter that allows authenticated attackers to execute arbitrary Python code. The validator uses a static regex blocklist that can be bypassed through obfuscation techniques, enabling attackers to execute code in the unsandboxed pyodide environment with full system access.

Affected products (as reported)

Vendor	Product	Versions
FlowiseAI	Flowise	0 – before 3.1.3
FlowiseAI	Flowise	0 – before 3.1.3

Weakness: CWE-94 · Vector: 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

References

GitHub Security Advisory (GHSA-4878-cqgq-j53v) vendor-advisory
VulnCheck Advisory: Flowise before 3.1.3 Code Injection via CSV Agent customReadCSV third-party-advisory