CVE-2025-71331Public exploitNetwork attack vector

Browser script execution via unsanitized chat content

Published Jun 20, 2026 · Updated Jun 20, 2026

Cross-site scripting in Flowise before 3.0.8 allows remote attackers to execute JavaScript in a victim's browser through crafted chat content. Chat message rendering and Agentflow Custom Function output accept iframe content with a javascript URL without neutralizing script-capable HTML. Execution requires a victim to view the affected chat or workflow, exposing cookies and session data to attacker-controlled code.

CVSS severity5.1
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Flowise before 3.0.8 allows remote attackers to execute JavaScript in a victim's browser through crafted chat content. Chat message rendering and Agentflow Custom Function output accept iframe content with a javascript URL without neutralizing script-capable HTML. Execution requires a victim to view the affected chat or workflow, exposing cookies and session data to attacker-controlled code.

The record

CVE
CVE-2025-71331
Published
Jun 20, 2026
Updated
Jun 20, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-80, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=0 <3.0.8

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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