FKIE_CVE-2026-118235

Vulnerability from fkie_nvd - Published: 2026-10-31 09:16 - Updated: 2026-10-31 09:16
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.10.2 via the handle_upload function. This is due to missing server-side file key allowlist and pre-sanitization extension derivation that allows a trailing-dot filename to bypass all extension and MIME validation in handle_upload. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The only access control is a nonce that is printed into every public form's data-nonce attribute, making it trivially obtainable by any unauthenticated visitor on a page embedding the form shortcode.
References
security@wordfence.comhttps://plugins.svn.wordpress.org/simple-form/trunk/
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L67
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L973
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L988
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L118
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L137
security@wordfence.comhttps://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L142
security@wordfence.comhttps://plugins.trac.wordpress.org/changeset/3770697/simple-form/trunk/app/FileUpload.php
security@wordfence.comhttps://www.wordfence.com/threat-intel/vulnerabilities/id/6aac2178-f6ce-4444-9afc-7e014547cd48?source=cve
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "SimpleForm \u2013 Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications",
          "vendor": "wpazleen",
          "versions": [
            {
              "lessThanOrEqual": "3.10.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@wordfence.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The SimpleForm \u2013 Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.10.2 via the handle_upload function. This is due to missing server-side file key allowlist and pre-sanitization extension derivation that allows a trailing-dot filename to bypass all extension and MIME validation in handle_upload. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The only access control is a nonce that is printed into every public form\u0027s data-nonce attribute, making it trivially obtainable by any unauthenticated visitor on a page embedding the form shortcode."
    }
  ],
  "id": "CVE-2026-118235",
  "lastModified": "2026-10-31T09:16:33.620",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security@wordfence.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-10-31T09:16:33.620",
  "references": [
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.svn.wordpress.org/simple-form/trunk/"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L67"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L973"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L988"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L118"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L137"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L142"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://plugins.trac.wordpress.org/changeset/3770697/simple-form/trunk/app/FileUpload.php"
    },
    {
      "source": "security@wordfence.com",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6aac2178-f6ce-4444-9afc-7e014547cd48?source=cve"
    }
  ],
  "sourceIdentifier": "security@wordfence.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ],
      "source": "security@wordfence.com",
      "type": "Primary"
    }
  ]
}



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