CVE-2026-109218 (GCVE-0-2026-109218)

Vulnerability from cvelistv5 – Published: 2026-10-28 06:45 – Updated: 2026-10-28 06:45
VLAI
Title
Contact Manager <= 9.1.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename Blacklist Bypass
Summary
The Contact Manager plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 9.1.2 via the add_message function. This is due to an incomplete extension blacklist that fails to detect dangerous extensions when a trailing dot causes the extension-derivation routine to return an empty string, which sanitize_file_name() then silently removes before the file is written to disk. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Successful code execution additionally requires the server to use Apache with libapache2-mod-php (which maps .phar to PHP by default) and the attacker to retrieve the uploaded file within the brief window before it is removed by unlink() at end of request.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2306 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
kleor Contact Manager Affected: 0 , ≤ 9.1.2 (semver)
guessed Create a notification for this product.
Credits
sermsak
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Contact Manager",
          "vendor": "kleor",
          "versions": [
            {
              "lessThanOrEqual": "9.1.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "sermsak"
        }
      ],
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          "value": "The Contact Manager plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 9.1.2 via the add_message function. This is due to an incomplete extension blacklist that fails to detect dangerous extensions when a trailing dot causes the extension-derivation routine to return an empty string, which sanitize_file_name() then silently removes before the file is written to disk. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Successful code execution additionally requires the server to use Apache with libapache2-mod-php (which maps .phar to PHP by default) and the attacker to retrieve the uploaded file within the brief window before it is removed by unlink() at end of request."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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      ],
      "problemTypes": [
        {
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              "description": "CWE-434 Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T06:45:19.576Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/b359ef59-4c2e-4d4e-b000-1845525131de?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php#L256"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php#L254"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/contact-manager.php#L42"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/forms/processing.php#L102"
        },
        {
          "url": "https://fr.wordpress.org/plugins/contact-manager/"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3767815%40contact-manager%2Ftags%2F9.1.3\u0026old=3661172%40contact-manager%2Ftags%2F9.1.2"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-10-12T13:58:49.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-10-27T18:42:18.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Contact Manager \u003c= 9.1.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename Blacklist Bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-109218",
    "datePublished": "2026-10-28T06:45:19.576Z",
    "dateReserved": "2026-10-12T13:43:55.568Z",
    "dateUpdated": "2026-10-28T06:45:19.576Z",
    "state": "PUBLISHED"
  },
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      "percentile": "0.50699"
    },
    "nvd": {
      "cve": {
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                "vendor": "kleor",
                "versions": [
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                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
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            ],
            "source": "security@wordfence.com"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
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          }
        ],
        "id": "CVE-2026-109218",
        "lastModified": "2026-10-28T13:46:33.207",
        "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",
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              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "security@wordfence.com",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-10-28T07:16:44.120",
        "references": [
          {
            "source": "security@wordfence.com",
            "url": "https://fr.wordpress.org/plugins/contact-manager/"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/contact-manager.php#L42"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php#L254"
          },
          {
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          },
          {
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          },
          {
            "source": "security@wordfence.com",
            "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3767815%40contact-manager%2Ftags%2F9.1.3\u0026old=3661172%40contact-manager%2Ftags%2F9.1.2"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/b359ef59-4c2e-4d4e-b000-1845525131de?source=cve"
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        "sourceIdentifier": "security@wordfence.com",
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            "description": [
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              }
            ],
            "source": "security@wordfence.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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