CVE-2026-44791Network attack vector

Authenticated RCE via XML prototype pollution bypass

Published Jun 23, 2026 · Updated Jun 23, 2026

Prototype pollution in the n8n XML node before 1.123.43, 2.20.7, and 2.22.1 allows remote authenticated users to execute host code. Crafted workflow data bypasses the earlier prototype-pollution fix, although n8n has not disclosed the faulty XML-processing operation. Exploitation requires permission to create or modify workflows, and code execution depends on chaining another node that consumes the polluted prototype.

CVSS severity9.4
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in the n8n XML node before 1.123.43, 2.20.7, and 2.22.1 allows remote authenticated users to execute host code. Crafted workflow data bypasses the earlier prototype-pollution fix, although n8n has not disclosed the faulty XML-processing operation. Exploitation requires permission to create or modify workflows, and code execution depends on chaining another node that consumes the polluted prototype.

The record

CVE
CVE-2026-44791
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-1321, CAPEC-180, T1059
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=< 1.123.43
  2. Affected versionversion=>= 2.0.0-rc.0, < 2.20.7
  3. Affected versionversion=>= 2.21.0, < 2.21.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

n8n · n8nversion=< 1.123.43; version=>= 2.0.0-rc.0, < 2.20.7; version=>= 2.21.0, < 2.21.1

Published CVSS scores

9.9NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.4GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
T1059Command and Scripting Interpreter

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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