{"id":"CVE-2026-54306","title":"n8n: Prototype Pollution enables confused-deputy execution via public webhooks","summary":"n8n: Prototype Pollution enables confused-deputy execution via public webhooks","severity":"medium","cvss":5.4,"cwe":["CWE-1321"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n >= 2.26.0, < 2.26.2","n8n < 2.25.7"],"patched":["n8n 2.26.2","n8n 2.25.7"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-2vff-hj5x-8gq7","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-2vff-hj5x-8gq7"},{"url":"https://github.com/advisories/GHSA-2vff-hj5x-8gq7"}],"tags":["ghsa","npm"],"epss":0.0028,"epssPercentile":0.20719,"ingestedAt":"2026-06-29T14:31:47.721Z","slug":"CVE-2026-54306","body":"## Overview\n\n## Impact\nA 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.\n\nWhere 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.\n\n## Patches\nThe issue has been fixed in n8n versions 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- Avoid exposing public (unauthenticated) webhook workflows that pass incoming data through transform nodes into action nodes with sensitive credentials or database operations.\n- Limit workflow creation and editing permissions to fully trusted users only.\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 >= 2.26.0, < 2.26.2`\n- `n8n < 2.25.7`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 2.26.2`\n- `n8n 2.25.7`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}