CVE-2025-71331

Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows

publishedCWE-80

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.

Technical severity5.1 mediumCVSS 4.0 · CNA: VulnCheck

Published2026-06-20Source updated 2026-11-08

Collected2026-11-083 attributed sources

Fixes and workarounds

Fix

flowise (npm): OSV reports a fixed version 3.0.8. Check the advisory for supported release branches.

Source: OSV GHSA-4fr9-3x69-36wv

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Flowise Flowise `flowise` npm	≥ 0; < 3.0.8 (affected, semver) 3.0.8 (unaffected, semver) Other versions: unaffected	CNA: VulnCheck
flowise `flowise` npm	≥ 0; < 3.0.8 (affected, semver); OSV events: introduced 0; fixed 3.0.8 Source events (semver) `[ { "introduced": "0" }, { "fixed": "3.0.8" } ]` Other versions: unaffected	OSV GHSA-4fr9-3x69-36wv

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 5.1 medium	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`	CNA: VulnCheck
3.1 / 6.1 medium	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`	CNA: VulnCheck

Exploit evidence

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wv
exploit · ADP: CISA-ADP

References

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wvCNA: VulnCheck · vendor-advisory
https://www.vulncheck.com/advisories/flowise-cross-site-scripting-in-chat-messages-and-agent-workflowsCNA: VulnCheck · third-party-advisory
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wvADP: CISA-ADP · exploit
https://github.com/advisories/GHSA-4fr9-3x69-36wvOSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-4fr9-3x69-36wvOSV / GitHub Security Advisories · osv

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