CVE-2026-54306

n8n: Prototype Pollution enables confused-deputy execution via public webhooks

Published Jun 23, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Description

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes. Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials. This vulnerability is fixed in 2.25.7 and 2.26.2.

Analysis

Technical impact

n8n, an open‑source workflow automation platform, is affected by a prototype‑pollution flaw that allows an attacker to craft a public webhook payload injecting attacker‑controlled fields into workflow data during internal object copying. These injected fields are surfaced as normal values by downstream built‑in nodes, giving the workflow the ability to act as a confused deputy: it can target unintended records or issue outbound requests using the workflow owner's configured credentials. The vulnerability is fixed in n8n releases 2.25.7 and 2.26.2.

Affected Systems

This issue affects n8n‑io's n8n platform in all releases prior to 2.25.7 and 2.26.2. Users running any earlier version that exposes public webhooks should consider this vulnerability present.

Risk and Exploitability

The CVSS score of 6.3 indicates medium severity. No EPSS score is available and the vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is external over the network: an attacker can send a crafted HTTP request to a public webhook endpoint and inject arbitrary properties that are subsequently processed by downstream nodes, enabling unintended execution with the workflow owner's credentials.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n8n-io

n8n

affected

Version	Status	Constraints
`>= 2.26.0, < 2.26.2`	affected	—
`< 2.25.7`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n::::::node.js::*

No data.

Vendor Product Versions

N8n

Version	Status	Scheme	Platform
`[2.26.0,2.26.2)`	affected	semver	—
`[0,2.25.7)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade n8n to version 2.25.7 or later, or to 2.26.2 if using the 2.26 branch.
If an immediate upgrade is not possible, restrict the exposure of public webhook endpoints to trusted IP addresses or internal networks.
Implement input validation or sanitization for webhook payloads to block unexpected fields before they are processed by downstream nodes.

Generated by OpenCVE AI on June 24, 2026 at 11:18 UTC.

Tracking

Advisories

Source	ID	Title
Github GHSA	GHSA-2vff-hj5x-8gq7	n8n: Prototype Pollution enables confused-deputy execution via public webhooks

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.280% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/n8n-io/n8n/security/advisories/GHSA-2vff-hj5x-8gq7

History

Jun 26, 2026 8:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jun 24, 2026 4:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		N8n N8n n8n
Vendors & Products		N8n N8n n8n

Jun 23, 2026 4:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes. Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials. This vulnerability is fixed in 2.25.7 and 2.26.2.
Title		n8n: Prototype Pollution enables confused-deputy execution via public webhooks
Weaknesses		CWE-1321
References		https://github.com/n8n-io/n8n/security/advisories/GHSA-2vff-hj5x-8gq7
Metrics		cvssV4_0 `{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}`