CVE-2026-106158: Cross-Site Scripting via Scheduler Resource Colors in Kendo UI for jQuery

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-15 · updated 2026-10-20
Weakness: CWE-80

Description

In Progress® Kendo® UI for jQuery, in v2026.3.811 and earlier, the Scheduler Day, Timeline, Month, and Agenda views insert resource color values into quoted event wrapper attributes without proper encoding. An attacker who can control a resource color can inject additional HTML attributes, including event handlers, and execute JavaScript in a user's browser when the affected event is interacted with. Successful exploitation can compromise the confidentiality and integrity of data accessible to the affected application. The earliest affected version has not been confirmed. This issue is fixed in version 2026.3.1015.

Affected products

Progress Software Kendo UI for jQuery: from 2014.3.1119 before 2026.3.1015 — fixed in 2026.3.1015

How to fix

Upgrade to a fixed version: Progress Software Kendo UI for jQuery 2026.3.1015. Check the vendor advisory for mitigations.

References

https://www.telerik.com/kendo-jquery-ui/documentation/knowledge-base/kb-security-scheduler-resource-color-xss-cve-2026-106158

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