# CVE-2026-106153: Progress Kendo UI for jQuery cross-site scripting in Calendar

Source: https://junglewise.ai/threats/cve-2026-106153-in-progress-kendo-ui-for-jquery-prior-to-version-2026-3-1015-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-15. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-106153 · Severity: medium · CVSS 5.4 · Published 2026-10-15

Progress Kendo UI for jQuery is a JavaScript library providing interactive UI components like calendars for web applications. The Calendar and MultiViewCalendar components fail to properly sanitize URLs and HTML attributes in month templates, allowing attackers with low privileges to inject JavaScript code. When users interact with a compromised calendar, malicious scripts execute in their browser, potentially stealing data or compromising account integrity.

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

## Quick answers

**Is CVE-2026-106153 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106153 being exploited in the wild.

**How severe is CVE-2026-106153?** Medium severity, with a CVSS score of 5.4, published 15 October 2026.

**Which products and versions are affected?** Progress Kendo UI for jQuery prior to 2026.3.1015.

**Is there a fix for CVE-2026-106153?** Yes: fixed in 2026.3.1015. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106153 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-106153?** Check whether you run Progress Kendo UI for jQuery or Progress Kendo Ui 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

## Technical details

The vulnerability is a CWE-79 cross-site scripting (XSS) flaw in the Calendar and MultiViewCalendar month content templates, which render data.url and data.title attributes without proper URL validation or HTML encoding. An attacker who can control the URL option or culture-derived title values can supply a javascript: URL or inject event-handler attributes; exploitation requires user interaction with the calendar (clicking/focusing) and low-privilege access to influence template data. The attacker gains arbitrary JavaScript execution in the victim's browser context.

## Affected products

- Progress Kendo UI for jQuery prior to 2026.3.1015

## Timeline

- 2026-10-15: disclosed
- 2026-10-15: patched: version 2026.3.1015 released

## References

- [https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-calendar-month-template-xss-cve-2026-106153](https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-calendar-month-template-xss-cve-2026-106153)

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