{"id":"CVE-2026-54301","title":"n8n: Same-Origin XSS in Respond to Webhook Node","summary":"n8n: Same-Origin XSS in Respond to Webhook Node","severity":"high","cvss":7.6,"cwe":["CWE-79"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n < 1.123.55","n8n >= 2.26.0, < 2.26.2","n8n >= 2.0.0-rc.0, < 2.25.7"],"patched":["n8n 1.123.55","n8n 2.26.2","n8n 2.25.7"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-v733-mwr6-fgcm","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-v733-mwr6-fgcm"},{"url":"https://github.com/advisories/GHSA-v733-mwr6-fgcm"}],"tags":["ghsa","npm"],"epss":0.00238,"epssPercentile":0.15131,"ingestedAt":"2026-06-29T14:31:47.722Z","slug":"CVE-2026-54301","body":"## Overview\n\n## Impact\nAn 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.\n\n## Patches\nThe issue has been fixed in n8n versions 1.123.55, 2.25.7, and 2.26.2. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Disable the Respond to Webhook node by adding `n8n-nodes-base.respondToWebhook` to the `NODES_EXCLUDE` environment variable.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.\n\n## Affected packages\n\n- `n8n < 1.123.55`\n- `n8n >= 2.26.0, < 2.26.2`\n- `n8n >= 2.0.0-rc.0, < 2.25.7`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 1.123.55`\n- `n8n 2.26.2`\n- `n8n 2.25.7`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}