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CVE-2026-109218

CRITICAL 9.8 CVSS 3.1
Published
October 28, 2026
Last modified
October 29, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-434
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • kleor Contact Manager — Up to and including 9.1.2

References

  • fr.wordpress.org https://fr.wordpress.org/plugins/contact-manager/
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/contact-manager.php#L42
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php#L254
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/add-message.php#L256
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/contact-manager/tags/9.1.2/includes/forms/processing.php#L102
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?reponame=&new=3767815%40contact-manager%2Ftags%2F9.1.3&old=3661172%40contact-manager%2Ftags%2F9.1.2
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/b359ef59-4c2e-4d4e-b000-1845525131de?source=cve
  • nvd.nist.gov Official NVD record