CVE-2026-106151: Cross-Site Scripting in Validator Validation Messages in Kendo UI for jQuery
In Progress® Kendo® UI for jQuery versions starting with 2012.2.710 and prior to 2026.3.1015, the Validator decodes validation messages from data-msg- attributes and parses the resulting text as HTML. An attacker who can modify a validation message can cause HTML that was correctly escaped in the page attribute to become active markup, including event handlers, when the user triggers validation. Successful exploitation can execute JavaScript in a user's browser and compromise the confidentiality and integrity of data accessible to the affected application. This issue is fixed in version 2026.3.1015.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Kendo UI for jQueryto a version that resolves this vulnerability.Fixed in 2026.3.1015
Event History
Frequently Asked Questions
Which deployments are exposed to this issue?
Applications using Progress Kendo UI for jQuery versions from 2012.2.710 through versions prior to 2026.3.1015 are affected when they use the Validator and validation messages can be modified by an attacker.
What must an attacker and victim do for exploitation to succeed?
An attacker must be able to modify a validation message in a data-msg-* attribute. A user must then trigger validation, causing the decoded message to be parsed as HTML and potentially execute attacker-supplied JavaScript.
What is the remediation?
Upgrade Progress Kendo UI for jQuery to version 2026.3.1015, which fixes the issue.