{"id":64118,"date":"2025-08-17T10:38:35","date_gmt":"2025-08-17T10:38:35","guid":{"rendered":""},"modified":"2025-09-26T20:58:28","modified_gmt":"2025-09-27T02:58:28","slug":"cve-2025-55150-ssrf-vulnerability-in-stirling-pdf-web-application","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55150-ssrf-vulnerability-in-stirling-pdf-web-application\/","title":{"rendered":"<strong>CVE-2025-55150: SSRF Vulnerability in Stirling-PDF Web Application<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In today&#8217;s post, we delve into the intricacies of a critical vulnerability discovered in the Stirling-PDF web application, a widely used locally hosted application that performs various operations on PDF files. The vulnerability, identified as CVE-2025-55150, affects the application&#8217;s ability to securely convert HTML to PDF, potentially leading to system compromise or data leakage. As the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53546-high-severity-vulnerability-in-folo-s-github-workflow\/\"  data-wpil-monitor-id=\"73421\">vulnerability scores an 8.6 on CVSS Severity<\/a> Score, understanding, detecting, and mitigating this risk is of paramount importance to prevent substantial damage to system integrity and confidentiality.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-55150<br \/>\nSeverity: Critical (8.6 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74940\">Potential system compromise or data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1975797357\" 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>Stirling-PDF | Prior to 1.1.0<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit leverages the \/api\/v1\/convert\/html\/pdf endpoint in the Stirling-PDF application. When converting HTML to PDF, the backend makes a call to a third-party tool and includes a sanitizer for security sanitization. However, due to insufficient security measures in place, an attacker can bypass this sanitizer, leading to a Server Side <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46385-severe-server-side-request-forgery-ssrf-vulnerability\/\"  data-wpil-monitor-id=\"76555\">Request Forgery<\/a> (SSRF) vulnerability. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47168-use-after-free-vulnerability-in-microsoft-office-word-allowing-unauthorized-code-execution\/\"  data-wpil-monitor-id=\"73195\">allows the attacker to make requests from the vulnerable<\/a> server to internal resources that would otherwise be inaccessible, potentially leading to system compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3159748942\" 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&#8217;s a conceptual example of how the vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/api\/v1\/convert\/html\/pdf HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n&quot;html&quot;: &quot;&lt;img src=&#039;http:\/\/localhost:8080\/internal_endpoint&#039;&gt;&quot;\n}<\/code><\/pre>\n<p>In this example, the attacker is using the HTML to PDF conversion feature to make an internal request, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53763-improper-access-control-in-azure-databricks-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"79827\">potentially accessing<\/a> sensitive information or functionality.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users of the affected <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44955-critical-vulnerability-in-ruckus-network-director-allows-jail-users-to-gain-root-access\/\"  data-wpil-monitor-id=\"76056\">Stirling-PDF<\/a> versions are urged to apply the vendor patch provided in version 1.1.0 to guard against this vulnerability. As a temporary mitigation measure, users can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31100-unrestricted-file-upload-leads-to-web-shell-deployment-in-mojoomla-school-management\/\"  data-wpil-monitor-id=\"84682\">deploy a Web<\/a> Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor and block potential SSRF attempts. However, the application of the vendor patch remains the most effective <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52376-authentication-bypass-vulnerability-in-nexxt-solutions-ncm-x1800-mesh-router\/\"  data-wpil-monitor-id=\"75457\">solution to this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In today&#8217;s post, we delve into the intricacies of a critical vulnerability discovered in the Stirling-PDF web application, a widely used locally hosted application that performs various operations on PDF files. The vulnerability, identified as CVE-2025-55150, affects the application&#8217;s ability to securely convert HTML to PDF, potentially leading to system compromise or data leakage. [&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":[101],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64118","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-ssrf"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64118","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=64118"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64118\/revisions"}],"predecessor-version":[{"id":77467,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64118\/revisions\/77467"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64118"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64118"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64118"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64118"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64118"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64118"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}