CVE-2026-54301

n8n: Same-Origin XSS in Respond to Webhook Node

MEDIUM

5.4

CVSS Score

Published: June 23, 2026 at 03:44 PM UTC

Updated: October 26, 2026 at 11:10 AM UTC

2 products affected across 2 vendorsN8NN8N

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Severity

MEDIUM5.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

N8N · N8Nnpm

95%

v < 1.123.552.0.0 ≤ v < 2.25.72.26.0 ≤ v < 2.26.2

Affected range stops below 1.123.55, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.25.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.26.2, so it looks safe — our inference, not a vendor statement

N8N · N8N Io

90%

v < 1.123.55

Affected range stops below 1.123.55, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.25.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.26.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/n8n-io/n8n/security/advisories/GHSA-v733-mwr6-fgcm

References (1)

x_refsource_CONFIRMMitigationVendor Advisory

Source: cverecord

https://github.com/n8n-io/n8n/security/advisories/GHSA-v733-mwr6-fgcm

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-79

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