Raw 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XSummary
CVE-2026-54306 is a medium-severity Prototype Pollution (CWE-1321) vulnerability in N8N N8N. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 18th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and AC-3 (Access Enforcement) — see the control section below for these in your framework.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-38474
Vulnerability Data
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Prototype pollution via crafted public webhook payload directly enables exploitation of a public-facing application (webhook endpoint) to achieve confused-deputy actions with owner credentials.
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
Mitigating Controls (NIST 800-53 r5) AI
Directly blocks crafted webhook payloads from performing prototype pollution by enforcing strict input validation and sanitization before object merging.
Enforces access decisions on workflow actions so that injected fields cannot cause the workflow to act as a confused deputy against arbitrary records or external systems.
Detects unauthorized modification of workflow data objects resulting from prototype pollution before downstream nodes consume attacker-controlled values.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require input validation and safe property assignment to prevent prototype pollution.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing in development catches prototype-pollution flaws before release.
Secure development lifecycle mandates input validation and object-handling controls that directly prevent prototype pollution.
Application security requirements explicitly call for safeguards against unsafe object attribute manipulation.
Secure architecture principles reduce the likelihood of prototype pollution through safe design patterns.
Secure coding standards directly prohibit unsafe prototype attribute assignment and require defensive checks.
Change-management processes ensure security fixes for prototype-pollution issues are tracked and deployed.