# CVE-2026-106159: Progress Kendo UI for jQuery XSS via ToolBar ButtonGroup URLs

Source: https://junglewise.ai/threats/cve-2026-106159-in-progress-kendo-ui-for-jquery-versions-starting-with-2022-3  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-15. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-106159 · Severity: medium · CVSS 4.7 · Published 2026-10-15

Progress Kendo UI for jQuery is a JavaScript component library that developers use to build interactive web applications. A vulnerability in the ToolBar ButtonGroup component allows attackers who control button URLs to inject and execute malicious JavaScript code in users' browsers by including whitespace and event handlers in URLs. This could let attackers steal user data or modify page content when users interact with the affected buttons.

Technologies: [Progress Kendo UI for jQuery](https://junglewise.ai/threats/technologies/kendo-ui-for-jquery). Vendors: [Progress](https://junglewise.ai/threats/vendors/progress).

## Quick answers

**Is CVE-2026-106159 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106159 being exploited in the wild.

**How severe is CVE-2026-106159?** Medium severity, with a CVSS score of 4.7, published 15 October 2026.

**Which products and versions are affected?** Progress Kendo UI for jQuery 2022.3.1109 through 2026.3.811.

**Is there a fix for CVE-2026-106159?** Yes: fixed in 2026.3.1015. Until then: If immediate upgrade is not possible, use only trusted, application-defined button URLs, or override the ButtonGroup _renderItems method to assign sanitized href values directly via the DOM attribute API instead of HTML string parsing. Keep button attributes application-controlled. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106159 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-106159?** Check whether you run Progress Kendo UI for jQuery at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 2026.3.1015

If immediate upgrade is not possible, use only trusted, application-defined button URLs, or override the ButtonGroup _renderItems method to assign sanitized href values directly via the DOM attribute API instead of HTML string parsing. Keep button attributes application-controlled.

## Technical details

The ToolBar ButtonGroup component fails to properly quote the href attribute after URL sanitization, allowing attribute injection through URLs containing whitespace. An attacker can supply an HTTPS URL with embedded attributes (such as event handlers) that are concatenated into the unquoted href, bypassing sanitization. This is a stored or reflected XSS requiring the attacker to control button URLs (via application configuration, API, or user input), but no authentication or special network conditions are required.

## Affected products

- Progress Kendo UI for jQuery 2022.3.1109 through 2026.3.811

## Timeline

- 2026-10-15: disclosed

## References

- [https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-toolbar-buttongroup-url-xss-cve-2026-106159](https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-toolbar-buttongroup-url-xss-cve-2026-106159)

## Related threats

- [Progress Telerik Kendo UI for jQuery Chart XSS in tooltip](https://junglewise.ai/threats/cve-2026-124698-in-progress-kendo-ui-for-jquery-the-chart-default-tooltip)
- [Progress Telerik Kendo UI for jQuery Chart XSS in shared-tooltip](https://junglewise.ai/threats/cve-2026-124697-in-progress-kendo-ui-for-jquery-chart-shared-tooltip-rendering)
- [Progress Kendo UI for jQuery Spreadsheet XSS in sheet names](https://junglewise.ai/threats/cve-2026-124696-in-progress-kendo-ui-for-jquery-spreadsheet-sheet-names-are)
- [Progress Telerik Kendo UI jQuery Form cross-site scripting in item hints](https://junglewise.ai/threats/cve-2026-124695-in-progress-kendo-ui-for-jquery-form-the-items-hint-option-is)
- [Progress Telerik Kendo UI for jQuery Gantt cross-site scripting in Parent dropdown](https://junglewise.ai/threats/cve-2026-124691-in-progress-kendo-ui-for-jquery-gantt-the-task-editor-s-parent)