Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M

CVE-2026-54306n8n: Prototype Pollution enables confused-deputy execution via public webhooks

Medium 6.3

In plain English

A medium-severity prototype pollution in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.3%top 79.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	2.26.2	GHSA-2vff-hj5x-8gq7
npm	n8n	2.25.7	GHSA-2vff-hj5x-8gq7

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	>= 2.26.0, < 2.26.2< 2.25.7

Weakness: CWE-1321 · 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

References

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