Vulnerability-Lookup

GHSA-27QV-W87H-69R6

Vulnerability from github – Published: 2026-08-25 09:30 – Updated: 2026-08-25 09:30

Details

The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mf_form_id' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor's save-time wp_kses_post filter because it contains no HTML tags, and MetForm's own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.

Severity

6.4 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-18100"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-25T08:18:08Z",
    "severity": "MODERATE"
  },
  "details": "The MetForm \u2013 Contact Form, Survey, Quiz, \u0026 Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via \u0027mf_form_id\u0027 Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor\u0027s save-time wp_kses_post filter because it contains no HTML tags, and MetForm\u0027s own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.",
  "id": "GHSA-27qv-w87h-69r6",
  "modified": "2026-08-25T09:30:37Z",
  "published": "2026-08-25T09:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18100"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/controls/form-picker-utils.php#L45"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/utils/util.php#L605"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/widgets/form.php#L143"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/controls/form-picker-utils.php#L45"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/utils/util.php#L605"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/widgets/form.php#L143"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3639278%40metform%2Ftrunk\u0026old=3618333%40metform%2Ftrunk"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/976f1f01-ad5d-413e-a208-ae4b71a61502?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-18100 (GCVE-0-2026-18100)

Vulnerability from cvelistv5 – Published: 2026-08-25 07:39 – Updated: 2026-08-25 18:12

Title

MetForm <= 4.1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'mf_form_id' Widget Setting

Summary

Severity

6.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 18:12 UTC

CWE

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

Assigner

Wordfence mitre root

References

8 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/metfor…
https://plugins.trac.wordpress.org/browser/metfor…
https://plugins.trac.wordpress.org/browser/metfor…
https://plugins.trac.wordpress.org/browser/metfor…
https://plugins.trac.wordpress.org/browser/metfor…
https://plugins.trac.wordpress.org/browser/metfor…
https://plugins.trac.wordpress.org/changeset?repo…

Impacted products

1 product

Vendor	Product	Version
roxnor	MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor	Affected: 0 , ≤ 4.1.8 (semver)

Credits

Jonah Burgess (CryptoCat)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-18100",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-25T18:12:43.152431Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-25T18:12:52.098Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "MetForm \u2013 Contact Form, Survey, Quiz, Conditional Forms, Form Templates \u0026 Custom Form Builder for Elementor",
          "vendor": "roxnor",
          "versions": [
            {
              "lessThanOrEqual": "4.1.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Jonah Burgess (CryptoCat)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The MetForm \u2013 Contact Form, Survey, Quiz, \u0026 Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via \u0027mf_form_id\u0027 Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor\u0027s save-time wp_kses_post filter because it contains no HTML tags, and MetForm\u0027s own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
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      ],
      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-79",
              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-08-25T07:39:50.408Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/976f1f01-ad5d-413e-a208-ae4b71a61502?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/utils/util.php#L605"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/controls/form-picker-utils.php#L45"
        },
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          "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/widgets/form.php#L143"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/utils/util.php#L605"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/controls/form-picker-utils.php#L45"
        },
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          "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/widgets/form.php#L143"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3639278%40metform%2Ftrunk\u0026old=3618333%40metform%2Ftrunk"
        }
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      "timeline": [
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          "lang": "en",
          "time": "2026-07-28T17:45:54.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-08-24T19:12:51.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "MetForm \u003c= 4.1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via \u0027mf_form_id\u0027 Widget Setting"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
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    "cveId": "CVE-2026-18100",
    "datePublished": "2026-08-25T07:39:50.408Z",
    "dateReserved": "2026-07-28T17:29:53.289Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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GHSA-27QV-W87H-69R6

CVE-2026-18100 (GCVE-0-2026-18100)

Tags

Sightings

Nomenclature

Related by attack behaviour