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CVE-2026-86076

n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution

HIGH
8.8
CVSS Score
Published: September 8, 2026 at 09:28 PM UTC
Updated: September 11, 2026 at 06:40 PM UTC
2 products affected across 2 vendorsN8NN8N

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution. The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.

Affected

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

N8N· N8Nnpm
95%
v < 1.123.762.0.0 ≤ v < 2.37.72.38.0 ≤ v < 2.38.2
Affected range stops below 1.123.76, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.37.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.38.2, so it looks safe — our inference, not a vendor statement
N8N· N8N Io
60%
v < 1.123.76v < 2.37.7v < 2.38.2
Affected range stops below 1.123.76, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.37.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.38.2, 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

References (4)

x_refsource_CONFIRMMitigationVendor Advisory
Source: cverecord
https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/n8n-io/n8n/releases/tag/[email protected]
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/n8n-io/n8n/releases/tag/[email protected]
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/n8n-io/n8n/releases/tag/[email protected]

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-94

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