Kleor vulnerabilities and threats

The Contact Manager plugin for WordPress up to version 9.1.2 contains an arbitrary file upload vulnerability due to improper handling of file extensions. This flaw allows unauthenticated attackers to upload potentially executable files by exploiting a trailing dot in filenames that bypasses extension checks. Successful exploitation can lead to remote code execution on servers running Apache with libapache2-mod-php, though the attack window is limited by file removal at request end.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Kleor Contact Manager contact-manager allows Reflected XSS.This issue affects Contact Manager: from n/a through <= 9.1.

Deserialization of Untrusted Data vulnerability in Kleor Contact Manager contact-manager allows Object Injection.This issue affects Contact Manager: from n/a through <= 9.1.1.

The Easy Timer plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.2.1 via the plugin's shortcodes. This is due to insufficient restriction of shortcode attributes. This makes it possible for authenticated attackers, with Editor-level access and above, to execute code on the server.

The Contact Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title’ parameter in all versions up to, and including, 8.6.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

The Contact Manager plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the contact form upload feature in all versions up to, and including, 8.6.4. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible in specific configurations where the first extension is processed over the final. This vulnerability also requires successfully exploiting a race condition in order to exploit.