{"id":26100,"date":"2025-04-18T04:06:02","date_gmt":"2025-04-18T04:06:02","guid":{"rendered":""},"modified":"2025-05-06T12:01:27","modified_gmt":"2025-05-06T12:01:27","slug":"cve-2025-3439-php-object-injection-vulnerability-in-everest-forms-wordpress-plugin","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-3439-php-object-injection-vulnerability-in-everest-forms-wordpress-plugin\/","title":{"rendered":"CVE-2025-3439: PHP Object Injection Vulnerability in Everest Forms WordPress Plugin<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The cybersecurity landscape is riddled with threats that can compromise the integrity and confidentiality of data systems across the globe. One such vulnerability, identified as CVE-2025-3439, poses a significant threat to WordPress sites utilizing the Everest Forms plugin. This vulnerability affects all versions<\/a> of the plugin up to and including 3.1.1. Given the popularity of WordPress and the extensive use of plugins to enhance its functionality, this vulnerability matters because it could potentially affect a large number of websites across the globe, leading to system<\/a> compromises or data leakage.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-3439
\nSeverity: Critical (CVSS Score: 9.8)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Possible system compromise or data<\/a> leakage due to PHP object injection<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Everest Forms WordPress Plugin<\/a> | Up to and including 3.1.1<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The Everest Forms WordPress plugin is vulnerable<\/a> to PHP Object Injection through the ‘field_value’ parameter. This vulnerability arises due<\/a> to the plugin’s mishandling of untrusted input, which allows for the deserialization of this input. An unauthenticated attacker<\/a> can exploit this flaw by injecting a malicious PHP object into the ‘field_value’ parameter. While this vulnerability does not inherently cause any harm, it can pave the way<\/a> for more destructive exploits if there is a POP (Property Oriented Programming) chain present in another plugin or theme installed on the site. Depending on the POP chain, this could allow an attacker to delete arbitrary files<\/a>, retrieve sensitive data, or execute malicious code.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Given below is a conceptual example of how the vulnerability might be exploited<\/a>. This is a sample HTTP request that injects a malicious PHP object<\/a> into the ‘field_value’ parameter.<\/p>\n

POST \/wp-admin\/admin-ajax.php?action=everest_form_save_form_entry HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nfield_value=O:8:\"stdClass\":1:{s:5:\"shell\";s:9:\"\/bin\/bash\";}<\/code><\/pre>\n
In the above example, a serialized PHP ‘stdClass’ object with a ‘shell’ property is injected<\/a> into the ‘field_value’ parameter. If a POP chain is present in the WordPress installation, this could potentially lead to remote code execution<\/a>.<\/p>\n
Mitigation<\/strong><\/p>\n
Users are strongly advised to apply the latest patches released by the vendor to remediate this vulnerability<\/a>. If for some reason patching is not possible, users should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability<\/a>. Regularly updating all plugins, themes, and the WordPress core<\/a> installation can also help prevent the installation of software containing a POP chain.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity landscape is riddled with threats that can compromise the integrity and confidentiality of data systems across the globe. One such vulnerability, identified as CVE-2025-3439, poses a significant threat to WordPress sites utilizing the Everest Forms plugin. This vulnerability affects all versions of the plugin up to and including 3.1.1. Given the popularity […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-26100","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-rce"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t