CVE-2026-106150 in Kendo UI for jQuery
Summary
by MITRE • 10/15/2026
In Progress® Kendo® UI for jQuery prior to 2026.3.1015, the Splitter and Window components starting with version 2011.2.804 and the Tooltip component starting with version 2013.1.319 construct iframe markup without properly sanitizing URL values or encoding the Window iframe title. An attacker with low privileges who can control these values can inject HTML attributes, including JavaScript event handlers, through an apostrophe in an iframe URL or a crafted title. When a user interacts with the affected component, injected JavaScript can execute in the user's browser context, compromising the confidentiality and integrity of accessible data.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified in Progress Kendo UI for jQuery represents a significant client-side security flaw rooted in improper input sanitization within core widget components. Specifically, this issue affects the Splitter and Window components introduced from version 2011.2.804 onwards, as well as the Tooltip component starting with version 2013.1.319. The root cause lies in how these JavaScript libraries construct iframe markup dynamically based on user-supplied or application-controlled values. When generating HTML elements for iframes, the library fails to adequately sanitize URL parameters and does not properly encode specific attributes such as the title of a Window component. This lack of rigorous encoding allows special characters, particularly apostrophes, to break out of their intended string contexts within the generated HTML structure.
From a technical perspective, this flaw enables an attacker with low privileges who can influence these input values to perform Cross-Site Scripting attacks. By injecting crafted strings containing JavaScript event handlers or other malicious attributes through an iframe URL or a window title, the attacker exploits the browser's default parsing behavior. When the affected component renders on the page and interacts with user events such as hovering over a tooltip or resizing a splitter, the injected code executes within the context of the victim's browser session. This execution occurs without any additional authentication or privilege escalation requirements beyond the ability to inject the initial payload into the application interface.
The operational impact of this vulnerability is severe regarding data confidentiality and integrity. Because the malicious JavaScript runs in the user’s own security context, it has access to all cookies, local storage items, session tokens, and DOM elements accessible to that domain. An attacker can leverage this capability to steal sensitive information such as authentication credentials or personally identifiable information. Furthermore, the ability to execute arbitrary scripts allows for actions like keylogging, form hijacking, or redirecting users to phishing sites. This compromises the trust model of web applications relying on Kendo UI components, potentially leading to widespread account takeovers and data breaches across any system integrating these vulnerable versions.
This vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation as a Cross-Site Scripting weakness. It also maps closely to the MITRE ATT&CK technique T1059.007, specifically JavaScript execution via browser-side scripting. The attack vector typically involves Stored or Reflected XSS depending on whether the malicious payload is persisted in the application's data store or injected directly into a request parameter that triggers immediate rendering.
To mitigate this risk, organizations must upgrade to Progress Kendo UI for jQuery version 2026.3.1015 or later, where these sanitization issues have been addressed by implementing strict output encoding and input validation mechanisms. For applications unable to update immediately due to compatibility constraints, defensive coding practices should be employed. Developers can implement custom event handlers that sanitize inputs before passing them to the Kendo UI widgets, ensuring that special characters are HTML-encoded or URL-escaped appropriately. Additionally, deploying a Web Application Firewall with robust XSS detection rules may help block exploitation attempts in transit, although this is not a substitute for fixing the underlying code defect. Regular security audits and static application security testing focused on DOM-based vulnerabilities are recommended to identify similar patterns in legacy JavaScript libraries.