{"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":"<strong>CVE-2025-3439: PHP Object Injection Vulnerability in Everest Forms WordPress Plugin<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3248-critical-code-injection-vulnerability-in-langflow-versions-prior-to-1-3-0\/\"  data-wpil-monitor-id=\"30408\">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, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-33033-audio-playback-memory-corruption-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"31266\">leading to system<\/a> compromises or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-3439<br \/>\nSeverity: Critical (CVSS Score: 9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: Possible <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-33113-memory-corruption-vulnerability-leading-to-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"31359\">system compromise or data<\/a> leakage due to PHP object injection<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2888509391\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>Everest <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-6220-piotnet-forms-plugin-vulnerability-in-wordpress-allows-arbitrary-file-uploads\/\"  data-wpil-monitor-id=\"34525\">Forms WordPress Plugin<\/a> | Up to and including 3.1.1<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The Everest Forms <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2006-arbitrary-file-upload-vulnerability-in-inline-image-upload-for-bbpress-wordpress-plugin\/\"  data-wpil-monitor-id=\"30200\">WordPress plugin is vulnerable<\/a> to PHP Object Injection through the &#8216;field_value&#8217; parameter. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-48297-discourse-platform-high-severity-vulnerability-due-to-expanded-chat-mentions\/\"  data-wpil-monitor-id=\"31509\">vulnerability arises due<\/a> to the plugin&#8217;s mishandling of untrusted input, which allows for the deserialization of this input. An <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-48263-unauthenticated-remote-attack-leading-to-dos-and-potential-rce\/\"  data-wpil-monitor-id=\"34379\">unauthenticated attacker<\/a> can exploit this flaw by injecting a malicious PHP object into the &#8216;field_value&#8217; parameter. While this vulnerability does not inherently cause any harm, it can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43971-critical-vulnerability-in-gobgp-paving-the-way-for-system-compromise\/\"  data-wpil-monitor-id=\"40140\">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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2525-arbitrary-file-upload-vulnerability-in-streamit-wordpress-theme\/\"  data-wpil-monitor-id=\"30677\">arbitrary files<\/a>, retrieve sensitive data, or execute malicious code.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-870835074\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Given below is a conceptual example of how the <a href=\"https:\/\/www.ameeba.com\/blog\/fortinet-s-fortigate-vulnerability-ssl-vpn-symlink-exploit-puts-user-access-at-risk-post-patching\/\"  data-wpil-monitor-id=\"30201\">vulnerability might be exploited<\/a>. This is a sample HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-52200-cross-site-request-forgery-csrf-leading-to-php-object-injection-in-armember-wordpress-plugin\/\"  data-wpil-monitor-id=\"35368\">request that injects a malicious PHP object<\/a> into the &#8216;field_value&#8217; parameter.<\/p>\n<pre><code class=\"\" data-line=\"\">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:&quot;stdClass&quot;:1:{s:5:&quot;shell&quot;;s:9:&quot;\/bin\/bash&quot;;}<\/code><\/pre>\n<p>In the above example, a serialized PHP &#8216;stdClass&#8217; <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27286-deserialization-of-untrusted-data-leads-to-object-injection-in-saoshyant-slider\/\"  data-wpil-monitor-id=\"36999\">object with a &#8216;shell&#8217; property is injected<\/a> into the &#8216;field_value&#8217; parameter. If a POP chain is present in the WordPress installation, this could potentially lead to remote <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-41788-critical-code-execution-vulnerability-in-sentron-7kt-pac1260-data-manager\/\"  data-wpil-monitor-id=\"30693\">code execution<\/a>.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>Users are strongly advised to apply the latest patches <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-34028-path-traversal-vulnerability-in-commvault-command-center-innovation-release-11-38\/\"  data-wpil-monitor-id=\"39817\">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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-50123-exploitable-vulnerability-in-hozard-alarm-system-sms-authentication\/\"  data-wpil-monitor-id=\"35369\">exploit this vulnerability<\/a>. Regularly updating all plugins, themes, and the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-0855-unauthenticated-php-object-injection-in-pgs-core-wordpress-plugin\/\"  data-wpil-monitor-id=\"43987\">WordPress core<\/a> installation can also help prevent the installation of software containing a POP chain.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/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,"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":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/26100","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=26100"}],"version-history":[{"count":14,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/26100\/revisions"}],"predecessor-version":[{"id":39356,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/26100\/revisions\/39356"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=26100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=26100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=26100"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=26100"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=26100"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=26100"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=26100"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=26100"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=26100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}