CVE-2026-106141 in Kendo UI for Angular
Summary
by MITRE • 11/06/2026
Cross-Site Scripting (XSS) in the Editor component (@progress/kendo-angular-editor) in Progress Software Kendo UI for Angular versions prior to 25.3.0 allows a low-privileged attacker who can supply Editor content to execute arbitrary JavaScript in another user's browser via a link or image with an unsafe URL in the Editor content, which runs when the user interacts with it.
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Analysis
by VulDB Data Team • 11/06/2026
The vulnerability identified as Cross-Site Scripting within the Progress Software Kendo UI for Angular editor component represents a significant security flaw affecting versions prior to 25.3.0. This issue stems from insufficient sanitization of HTML content processed by the Editor, specifically when handling hyperlinks and image sources. The core technical failure lies in the application's inability to properly validate or escape potentially malicious payloads embedded within URL attributes such as href for links or src for images. When a user with low privileges inputs content containing these elements into the editor, the system fails to strip out dangerous JavaScript protocols like javascript: before rendering them back to other users who view that content.
From an operational perspective, this flaw allows an attacker to craft malicious URLs that execute arbitrary JavaScript code in the context of another victim's browser session. The execution is triggered not merely by viewing the page but specifically when a user interacts with the compromised element, such as clicking on a link or hovering over an image depending on the specific implementation details and event handlers involved. This interaction-based trigger makes the attack vector subtle and difficult to detect through passive monitoring alone. Once executed, the injected script operates within the same origin policy as the vulnerable application, granting it access to sensitive cookies, session tokens, local storage data, and potentially allowing for actions performed on behalf of the victim user.
This vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation known commonly as Cross-site Scripting. The attack technique is further categorized under MITRE ATT&CK T1059, specifically Command and Scripting Interpreter subcategories related to JavaScript execution in a browser environment. By leveraging this flaw, an attacker can perform session hijacking, deface the application interface, or redirect users to phishing sites that mimic legitimate pages within the same domain trust boundary. The impact is particularly severe because it exploits the trusted relationship between the user and the web application, bypassing standard security controls like Same-Origin Policy protections since the malicious script originates from a valid source URL on the vulnerable server.
Mitigation strategies must focus on rigorous input validation and output encoding at multiple layers of the architecture. Developers should ensure that all HTML content is sanitized using robust libraries such as DOMPurify before being rendered by the Angular framework, ensuring that dangerous protocols like javascript: are strictly blocked or escaped. Upgrading to version 25.3.0 or later of Kendo UI for Angular resolves this issue through improved sanitization logic within the Editor component. Additionally, implementing Content Security Policy headers can provide a secondary layer of defense by restricting script execution sources and preventing inline scripts from running even if they are injected into the DOM. Regular security audits and static code analysis tools configured to detect unsafe HTML binding practices in Angular templates will help prevent similar vulnerabilities in future development cycles.