---
id: CVE-2026-109218
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 ext…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-434
vendor: kleor
product: Contact Manager
affected:
  - contact_manager <= 9.1.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-29T01:29:48.595341Z'
published: '2026-10-28'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T01:41:51.263Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109218'
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=&new=3767815%40contact-manager%2Ftags%2F9.1.3&old=3661172%40contact-manager%2Ftags%2F9.1.2
tags:
  - cve.org
epss: 0.00643
epssPercentile: 0.51114
ingestedAt: '2026-10-28T07:06:27.105Z'
---

## Overview

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

- `contact_manager <= 9.1.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.