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CriticalVulnerabilityCVE-2026-109218updated 28 Oct 2026, 10:24 UTC

Contact Manager WordPress plugin lets anonymous users upload risky files

Anyone on the internet can upload a file to the website without logging in. Under specific server settings, that file could be run as a program, letting an attacker take over the server.

Official, 2 sources
SeverityCriticalCVSS 9.8 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Anonymous attackerNo login needed to reach the form
  2. 2Crafted upload requestFilename ends with a trailing dot
  3. 3Extension check bypassedEmpty extension lets dangerous file through
  4. 4File saved then removedAttacker must fetch it before deletion
  5. 5Code runs on serverPossible via .phar under Apache with PHP
  6. ResultAttacker may run code on the server

What happened

The Contact Manager plugin's add_message function fails to block dangerous file extensions when the filename ends in a trailing dot, because the extension check returns an empty string and sanitize_file_name() strips the dot. This allows unauthenticated arbitrary file upload that may enable remote code execution.

Why it is dangerous: An attacker who succeeds could run code on the web server, gaining control of the site and its data. Sites using this plugin on Apache with libapache2-mod-php are most at risk.

Are you affected?

You are affected if you run Contact Manager plugin for WordPress version 9.1.2 or earlier, on an Apache server with libapache2-mod-php.

Contact Manager plugin for WordPress, all versions up to and including 9.1.2

What to do

  1. Check whether your site runs Contact Manager plugin version 9.1.2 or earlier and update it as soon as a fixed version is released
  2. Until a fix is available, disable or remove the Contact Manager plugin
  3. Check your server configuration: Apache with libapache2-mod-php maps .phar files to PHP, which increases risk
  4. Review your uploads folder for unexpected or unknown files

Timeline

  1. 28 Oct 2026, 07:16 UTC
    Publicly disclosed
  2. 28 Oct 2026, 07:16 UTC
    Reported by NVD · NVD
  3. 28 Oct 2026, 07:18 UTC
    Picked up by Zero Radar
  4. 28 Oct 2026, 10:24 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-109218 · GHSA-gfc3-vp5h-pp8w
CVSS
9.8 / 10
EPSS
0.6% chance of exploitation within 30 days
Disclosed
28 Oct 2026, 07:16 UTC
On Zero Radar
28 Oct 2026, 07:18 UTC (2 min after disclosure)
Last change
28 Oct 2026, 10:24 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Contact Manager WordPress plugin lets anonymous users upload risky files · Zero Radar