# CVE-2026-124688: Progress Kendo UI for jQuery XSS in TabStrip, PanelBar, Menu widgets

Source: https://junglewise.ai/threats/cve-2026-124688-in-progress-kendo-ui-for-jquery-prior-to-2026-4-1111-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-124688 · Severity: high · CVSS 7.1 · Published 2026-11-11

Progress Kendo UI for jQuery is a JavaScript library that provides interactive UI widgets for web applications. The TabStrip, PanelBar, and Menu widgets contain a cross-site scripting (XSS) vulnerability where an attacker who controls the data source can inject malicious JavaScript that executes in the victim's browser. This allows the attacker to steal session data, modify page content, or perform actions on behalf of the authenticated user.

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-2026-124688 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124688 being exploited in the wild.

**How severe is CVE-2026-124688?** High severity, with a CVSS score of 7.1, published 11 November 2026.

**Which products and versions are affected?** Progress Kendo UI for jQuery prior to 2026.4.1111.

**Is there a fix for CVE-2026-124688?** Yes: fixed in 2026.4.1111. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-124688 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-124688?** 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 2026.4.1111

## Technical details

The TabStrip, PanelBar, and Menu widgets allow mapping a dataSource field to the spriteCssClass attribute. Insufficient sanitization of this field permits attribute breakout and markup injection, including event handler attributes. The injected JavaScript executes in the application's origin with the victim's privileges when a page containing the affected widget is loaded, requiring only that the attacker control the mapped data source.

## Affected products

- Progress Kendo UI for jQuery prior to 2026.4.1111

## Timeline

- 2026-11-11: advisory

## References

- [https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-tabstrip-panelbar-menu-spritecssclass-xss-cve-2026-124688](https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-tabstrip-panelbar-menu-spritecssclass-xss-cve-2026-124688)

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- [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)
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- [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)