CVE-2026-54303Network attack vector

Reflected XSS via unsanitized verification query parameter

Published Jun 23, 2026 · Updated Jun 23, 2026

Reflected XSS in n8n before 2.24.0 allows remote authenticated users to execute script in the n8n origin via a crafted verification URL. Meta and Microsoft Teams trigger endpoints copy a query parameter into the HTTP response without sanitization or Content-Security-Policy protection. Exploitation requires an affected trigger workflow and a logged-in user to visit the crafted URL, exposing data and actions available to that browser session.

CVSS severity6.8
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in n8n before 2.24.0 allows remote authenticated users to execute script in the n8n origin via a crafted verification URL. Meta and Microsoft Teams trigger endpoints copy a query parameter into the HTTP response without sanitization or Content-Security-Policy protection. Exploitation requires an affected trigger workflow and a logged-in user to visit the crafted URL, exposing data and actions available to that browser session.

The record

CVE
CVE-2026-54303
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 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=< 2.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

n8n · n8nversion=< 2.24.0

Published CVSS scores

6.8n8nCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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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