Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-25051

n8n's Improper CSP Enforcement in Webhook Responses May Allow Stored XSS
Back to all
CVE

CVE-2026-25051

n8n's Improper CSP Enforcement in Webhook Responses May Allow Stored XSS

Impact

A Cross-site Scripting (XSS) vulnerability has been identified in the handling of webhook responses and related HTTP endpoints. Under certain conditions, the Content Security Policy (CSP) sandbox protection intended to isolate HTML responses may not be applied correctly.

An authenticated user with permission to create or modify workflows could abuse this to execute malicious scripts with same-origin privileges when other users interact with the crafted workflow. This could lead to session hijacking and account takeover.

Patches

The issue has been fixed in n8n versions 1.122.5 and 1.123.2. Users should upgrade to these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

  • Limit workflow creation and editing permissions to fully trusted users only.
  • Never execute untrusted workflows.
  • Review workflows that receive data from via webhooks, forms, or MCP servers to ensure they are communicating with trusted entities before executing them manually.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

---

n8n has adopted CVSS 4.0 as primary score for all security advisories. CVSS 3.1 vector strings are provided for backward compatibility.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.5
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/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:X
C
H
U
0
-
C
H
U
8.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-825q-w924-xhgx, https://nvd.nist.gov/vuln/detail/CVE-2026-25051, https://github.com/n8n-io/n8n/commit/ced34c0f93ab4c759a56065965986094d8ef7323, https://github.com/n8n-io/n8n/commit/e8cf4d6bb3af94dc296cbb67bc3dd20e9b508ac9, https://github.com/n8n-io/n8n

Severity

8.1

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.1
EPSS Probability
0.00012%
EPSS Percentile
0.01552%
Introduced Version
1.123.0,2.0.0-rc.0,1.122.0,1.102.0
Fix Available
1.123.2,2.1.0,1.122.1,1.121.2

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading