CVE-2024-27476 in Leantime
Summary
by MITRE • 04/10/2024
Leantime 3.0.6 is vulnerable to HTML Injection via /dashboard/show#/tickets/newTicket.
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Analysis
by VulDB Data Team • 09/07/2026
The vulnerability identified in Leantime version 3.0.6 represents a significant security flaw within the application's ticketing subsystem, specifically located at the endpoint associated with creating new tickets on the dashboard interface. This issue is classified as an HTML Injection vulnerability, which falls under the broader category of Cross-Site Scripting (XSS) when the injected content includes executable scripts or event handlers that can be interpreted by a victim's web browser. The specific path /dashboard/show#/tickets/newTicket indicates that this functionality is part of the client-side routing mechanism often used in single-page applications, where user input may not be sufficiently sanitized before being rendered back into the Document Object Model without proper encoding or validation checks.
From a technical perspective, HTML Injection occurs when an application includes untrusted data in its output without validating or escaping special characters that have meaning within HTML syntax. In this context, it is likely that fields such as ticket titles, descriptions, or other user-provided metadata are reflected directly into the page structure upon submission or display. If these inputs contain raw HTML tags like <script>, <img>, or <iframe> along with event attributes such as onerror or onload, a malicious actor can craft a payload that executes arbitrary JavaScript code in the context of the victim's session. This differs from stored XSS if the injection is immediate and reflected during the request processing phase, but it still poses severe risks depending on whether the input persists in the database for later retrieval by other users.
The operational impact of this vulnerability extends beyond mere visual defacement or local script execution. An attacker can leverage HTML Injection to perform session hijacking by stealing authentication cookies or tokens stored in browser storage if HttpOnly flags are not strictly enforced across all sensitive cookies. Furthermore, the attacker could conduct phishing attacks within the trusted domain context, tricking users into entering credentials on a fake login form embedded via injected HTML elements that mimic legitimate Leantime interface components. This erodes user trust and compromises the confidentiality and integrity of data managed through the platform, including project details, team communications, and sensitive business information housed in ticket records.
This vulnerability aligns with CWE-80, which describes Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS), as well as potentially CWE-79 if script execution is involved. In terms of the MITRE ATT&CK framework, this behavior maps to techniques under T1189 Drive-by Client-Side Code Execution or T1053 Scheduled Task/Job if persistence mechanisms are attempted via injected scripts that interact with local system resources through browser APIs. It also relates to T1071 Application Layer Protocol for command and control communications if the payload exfiltrates data to an external server controlled by the attacker.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary fix involves implementing strict input validation and output encoding on all user-supplied fields within the ticket creation workflow. Developers should utilize context-aware escaping libraries that encode special characters such as <, >, &, ", and ' into their corresponding HTML entities before rendering them in the browser. Additionally, adopting a Content Security Policy (CSP) header can significantly reduce the impact of any successful injection by restricting sources from which scripts are allowed to load, thereby preventing inline script execution even if an attacker manages to inject malicious code. Upgrading Leantime to patched versions that address this specific flaw is critical for restoring security integrity.