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Vulnerability details: VCID-gvjm-hukc-93f8
Vulnerability ID VCID-gvjm-hukc-93f8
Aliases CVE-2026-42231
GHSA-q5f4-99jv-pgg5
Summary n8n has Prototype Pollution in XML Webhook Body Parser that Leads to RCE ## Impact A flaw in the `xml2js` library used to parse XML request bodies in n8n's webhook handler allowed prototype pollution via a crafted XML payload. An authenticated user with permission to create or modify workflows could exploit this to pollute the JavaScript object prototype and, by chaining the pollution with the Git node's SSH operations, achieve remote code execution on the n8n host. ## Patches The issue has been fixed in n8n versions 1.123.32, 2.17.4, and 2.18.1. Users should upgrade to one of these versions or later to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation and editing permissions to fully trusted users only. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures. --- n8n has adopted CVSS 4.0 as primary score for all security advisories. CVSS 3.1 vector strings are provided for backwards compatibility. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00471 https://api.first.org/data/v1/epss?cve=CVE-2026-42231
cvssv3.1 10.0 https://github.com/n8n-io/n8n
cvssv4 10.0 https://github.com/n8n-io/n8n
generic_textual CRITICAL https://github.com/n8n-io/n8n
cvssv3.1 10.0 https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
cvssv4 10.0 https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
cvssv4 9.4 https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
generic_textual CRITICAL https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
ssvc Track https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
cvssv3.1 10.0 https://nvd.nist.gov/vuln/detail/CVE-2026-42231
cvssv4 10.0 https://nvd.nist.gov/vuln/detail/CVE-2026-42231
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2026-42231
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-42231
https://github.com/n8n-io/n8n
https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
https://nvd.nist.gov/vuln/detail/CVE-2026-42231
GHSA-q5f4-99jv-pgg5 https://github.com/advisories/GHSA-q5f4-99jv-pgg5
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/n8n-io/n8n
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Found at https://github.com/n8n-io/n8n
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

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Vector: 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 Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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none

present

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passive

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Vector: SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-05-04T20:17:57Z/ Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42231
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42231
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

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none

passive

active

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none

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Exploit Prediction Scoring System (EPSS)
Percentile 0.65002
EPSS Score 0.00471
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:53:03.185969+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q5f4-99jv-pgg5/GHSA-q5f4-99jv-pgg5.json 38.6.0