Vulnerability-Lookup

CVE-2026-56358 (GCVE-0-2026-56358)

Vulnerability from cvelistv5 – Published: 2026-06-24 11:53 – Updated: 2026-06-24 11:53

Title

n8n - Stored Cross-Site Scripting in Form Trigger Node

Summary

n8n before 1.123.25 (1.x) and before 2.11.2 (2.x), with the fix also included in 2.12.0, contains a stored cross-site scripting vulnerability in the Form Trigger node's CSS sanitization that allows authenticated users to inject malicious scripts. Attackers with workflow creation permissions can inject XSS payloads that execute persistently for all form visitors, enabling form hijacking and phishing attacks.

Severity

5.1 (Medium)


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

5.4 (Medium)


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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/n8n-io/n8n/security/advisories…	vendor-advisory
https://www.vulncheck.com/advisories/n8n-stored-c…	third-party-advisory

Impacted products

3 products

Vendor	Product	Version
n8n	n8n	Affected: 0 , < 1.123.25 (semver) Unaffected: 1.123.25 (semver) Affected: 2.0.0-rc.0 , < 2.11.2 (semver) Unaffected: 2.11.2 (semver)
n8n	n8n	Affected: 0 , < 2.11.2 (semver) Unaffected: 2.11.2 (semver)
n8n	n8n	Affected: 0 , < 1.123.25 (semver) Unaffected: 1.123.25 (semver)

Date Public

2026-03-25 00:00

Credits

tr4ce-ju

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/n8n",
          "product": "n8n",
          "vendor": "n8n",
          "versions": [
            {
              "lessThan": "1.123.25",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "1.123.25",
              "versionType": "semver"
            },
            {
              "lessThan": "2.11.2",
              "status": "affected",
              "version": "2.0.0-rc.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.11.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/n8n",
          "product": "n8n",
          "vendor": "n8n",
          "versions": [
            {
              "lessThan": "2.11.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.11.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/n8n",
          "product": "n8n",
          "vendor": "n8n",
          "versions": [
            {
              "lessThan": "1.123.25",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "1.123.25",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
                  "versionEndExcluding": "1.123.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*",
                  "versionEndExcluding": "2.11.2",
                  "versionStartIncluding": "2.0.0-rc.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "tr4ce-ju"
        }
      ],
      "datePublic": "2026-03-25T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "n8n before 1.123.25 (1.x) and before 2.11.2 (2.x), with the fix also included in 2.12.0, contains a stored cross-site scripting vulnerability in the Form Trigger node\u0027s CSS sanitization that allows authenticated users to inject malicious scripts. Attackers with workflow creation permissions can inject XSS payloads that execute persistently for all form visitors, enabling form hijacking and phishing attacks."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T11:53:19.735Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-q4fm-pjq6-m63g)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-q4fm-pjq6-m63g"
        },
        {
          "name": "VulnCheck Advisory: n8n - Stored Cross-Site Scripting in Form Trigger Node",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-form-trigger-node"
        }
      ],
      "title": "n8n - Stored Cross-Site Scripting in Form Trigger Node",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-56358",
    "datePublished": "2026-06-24T11:53:19.735Z",
    "dateReserved": "2026-06-20T21:16:53.711Z",
    "dateUpdated": "2026-06-24T11:53:19.735Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-Q4FM-PJQ6-M63G

Vulnerability from github – Published: 2026-03-27 18:05 – Updated: 2026-06-24 13:09

Summary

n8n has a Stored XSS Vulnerability in its Form Trigger

Details

Impact

An authenticated user with permission to create or modify workflows could exploit a flaw in the Form Trigger node's CSS sanitization to store a cross-site scripting (XSS) payload. The injected script executes persistently for every visitor of the published form, enabling form submission hijacking and phishing. The existing Content Security Policy prevents direct n8n session cookie theft but does not prevent script execution or form action manipulation.

Patches

The issue has been fixed in n8n versions 2.12.0, 2.11.2, and 1.123.25. 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: - Limit workflow creation and editing permissions to fully trusted users only. - Disable the Form Trigger node by adding n8n-nodes-base.formTrigger to the NODES_EXCLUDE environment variable.

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

Severity

5.4 (Medium)


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

5.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "n8n"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0-rc.0"
            },
            {
              "fixed": "2.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "n8n"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.123.25"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-56358"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-27T18:05:47Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Impact\nAn authenticated user with permission to create or modify workflows could exploit a flaw in the Form Trigger node\u0027s CSS sanitization to store a cross-site scripting (XSS) payload. The injected script executes persistently for every visitor of the published form, enabling form submission hijacking and phishing. The existing Content Security Policy prevents direct n8n session cookie theft but does not prevent script execution or form action manipulation.\n\n## Patches\nThe issue has been fixed in n8n versions 2.12.0, 2.11.2, and 1.123.25. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Disable the Form Trigger node by adding `n8n-nodes-base.formTrigger` to the `NODES_EXCLUDE` environment variable.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.",
  "id": "GHSA-q4fm-pjq6-m63g",
  "modified": "2026-06-24T13:09:16Z",
  "published": "2026-03-27T18:05:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-q4fm-pjq6-m63g"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/n8n-io/n8n"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "n8n has a Stored XSS Vulnerability in its Form Trigger"
}

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.

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