Medium 6.1Published Jun 20, 2026

CVE-2025-71331Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows

Updated under an hour ago (Oct 28, 2026, 7:40 AM ET)

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It affects Flowise and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Flowise

Exploited in the last 30 days

Flowise before 3.0.8 contains a cross-site scripting (XSS) vulnerability caused by insufficient input filtering in chat messages and custom agent functions. An attacker can inject malicious JavaScript by sending an iframe payload (e.g., <iframe src="javascript:alert(document.cookie)">) in a chat box, or by having a custom agent function return an XSS payload from an external website. The injected script executes in the victim's browser, enabling theft of cookies and session data.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-80
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Jun 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Flowise Flowise flowise:flowise (from the name)	before 3.0.8; 3.0.8 not affected	CNA record
flowiseai flowise flowiseai:flowise	before 3.0.8	NVD

References

References

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wv	vendor-advisory, exploit
https://www.vulncheck.com/advisories/flowise-cross-site-scripting-in-chat-messages-and-agent-workflows	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.