# CVE-2026-124689: Progress Kendo UI for jQuery ActionSheet XSS in header encoding

Source: https://junglewise.ai/threats/cve-2026-124689-in-progress-kendo-ui-for-jquery-versions-2026-3-1014-up-to-but  
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-2026-124689 · Severity: high · CVSS 7.1 · Published 2026-11-11

Progress Kendo UI for jQuery is a JavaScript component library used to build web application interfaces. Versions 2026.3.1014 through 2026.4.1109 contain a cross-site scripting vulnerability in the ActionSheet component that fails to encode user-supplied text in titles, subtitles, and button labels. An attacker who can control these values can inject malicious JavaScript code that executes in users' browsers, potentially stealing data or performing unauthorized actions.

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-2026-124689 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124689 being exploited in the wild.

**How severe is CVE-2026-124689?** High severity, with a CVSS score of 7.1, published 11 November 2026.

**Which products and versions are affected?** Progress Kendo UI for jQuery 2026.3.1014 up to but not including 2026.4.1110.

**Is there a fix for CVE-2026-124689?** Yes: fixed in 2026.4.1110. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-124689 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-124689?** 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 2026.4.1110

## Technical details

The ActionSheet component does not properly encode title, subtitle, and header button label values before rendering them to the DOM, allowing injection of arbitrary HTML and JavaScript. The vulnerability requires an attacker to control the values passed to these component properties, which may occur if they derive from user input or untrusted data sources. Exploitation yields arbitrary JavaScript execution in the user's browser context with access to session data and credentials.

## Affected products

- Progress Kendo UI for jQuery 2026.3.1014 up to but not including 2026.4.1110

## Timeline

- 2026-11-11: disclosed

## References

- [https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-kendo-actionsheet-header-xss-cve-2026-124689](https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-kendo-actionsheet-header-xss-cve-2026-124689)

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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)