Vulnerability-Lookup

CVE-2026-86076 (GCVE-0-2026-86076)

Vulnerability from cvelistv5 – Published: 2026-09-08 21:28 – Updated: 2026-09-09 15:33

Title

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

Summary

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.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-09 15:33 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/n8n-io/n8n/security/advisories…	x_refsource_CONFIRM
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76	x_refsource_MISC
https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7	x_refsource_MISC
https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
n8n-io	n8n	Affected: >= 2.38.0, < 2.38.2 Affected: >= 2.0.0, < 2.37.7 Affected: < 1.123.76	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86076

Vulnerability from fkie_nvd - Published: 2026-09-08 22:19 - Updated: 2026-09-09 20:16

Severity

8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76
	security-advisories@github.com	https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
	security-advisories@github.com	https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2
	security-advisories@github.com	https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n8n",
          "vendor": "n8n-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.38.0, \u003c 2.38.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.37.7"
            },
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    }
  ],
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  "lastModified": "2026-09-09T20:16:54.383",
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          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
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GHSA-HW8V-XXG5-VVVX

Vulnerability from github – Published: 2026-09-10 15:11 – Updated: 2026-09-10 15:11

Summary

n8n: Expression Sandbox Escape via Class-Field Sanitizer Rebinding Can Lead to Code Execution

Details

Impact

The expression compiler's sanitizer resolved through a dynamically-scoped this, so a class field named __sanitize rebound it and reached the Function constructor. On the backend, any expression author could run code in the n8n process; in the editor preview, a member's expression could run as JavaScript in the session of whoever opened the workflow. The patch rejects reserved class-member names.

Patches

The issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Restrict n8n instance access to fully trusted users only. - Avoid granting workflow-create or workflow-edit permissions to untrusted users. - Audit existing workflows for unexpected or unfamiliar expressions in node parameters. - Set N8N_EXPRESSION_ENGINE=vm.

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

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N

Show details on source website

JSON

To clipboard

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      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.37.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-86076"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-10T15:11:07Z",
    "nvd_published_at": "2026-09-08T22:19:16Z",
    "severity": "HIGH"
  },
  "details": "## Impact\n\nThe expression compiler\u0027s sanitizer resolved through a dynamically-scoped `this`, so a class field named `__sanitize` rebound it and reached the `Function` constructor. On the backend, any expression author could run code in the n8n process; in the editor preview, a member\u0027s expression could run as JavaScript in the session of whoever opened the workflow. The patch rejects reserved class-member names.\n\n## Patches\n\nThe issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\n\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict n8n instance access to fully trusted users only.\n- Avoid granting workflow-create or workflow-edit permissions to untrusted users.\n- Audit existing workflows for unexpected or unfamiliar expressions in node parameters.\n- Set `N8N_EXPRESSION_ENGINE=vm`.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.",
  "id": "GHSA-hw8v-xxg5-vvvx",
  "modified": "2026-09-10T15:11:07Z",
  "published": "2026-09-10T15:11:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86076"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/n8n-io/n8n"
    },
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76"
    },
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "n8n: Expression Sandbox Escape via Class-Field Sanitizer Rebinding Can Lead to Code Execution"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-86076 (GCVE-0-2026-86076)

FKIE_CVE-2026-86076

GHSA-HW8V-XXG5-VVVX

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature