CVE-2026-54301
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk12th percentile — higher than 12% of all known CVEs
Summary
In n8n before versions 1.123.55, 2.25.7, and 2.26.2, an authenticated user with workflow edit access could configure a Respond to Webhook node to serve binary content with an attacker-controlled Content-Type. The binary response path bypassed the central Content-Security-Policy sandbox header, allowing a public webhook to execute JavaScript in the n8n origin when visited by an authenticated user, with access to that user's session.
Risk Assessment
The risk involves potential session hijacking of an authenticated user by executing malicious JavaScript in the n8n origin context, which could lead to data theft or unauthorized actions within the system.
Recommendation
It is recommended to immediately update n8n to version 1.123.55, 2.25.7, or 2.26.2, which contain the fix for this vulnerability.
Original NVD description (English source)
n8n is an open source workflow automation platform. Prior to 1.123.55, 2.25.7, and 2.26.2, an authenticated user with workflow edit access could configure a Respond to Webhook node to serve binary content with an attacker-controlled Content-Type. The binary response path bypassed the central Content-Security-Policy sandbox header, allowing a public webhook to execute JavaScript in the n8n origin when visited by an authenticated user, with access to that user's session. This vulnerability is fixed in 1.123.55, 2.25.7, and 2.26.2.