CVE-2026-106151 Progress Software CVE debrief

Who should care

Defenders responsible for applications using Progress Kendo UI for jQuery, especially those with user-input validation, should assess exposure and apply the patch. This includes developers, security teams, and IT professionals managing applications that utilize Kendo UI for jQuery. They should prioritize verifying exposure and applying the patch to prevent potential JavaScript injection attacks.

Why it matters

CVE-2026-106151 is a medium-severity vulnerability in Progress Kendo UI for jQuery that allows an attacker to execute JavaScript in a user's browser by modifying validation messages. Defenders should prioritize verifying exposure and applying the patch, especially for applications using affected Kendo UI versions.

• An attacker can execute JavaScript in a user's browser
• Confidentiality and integrity of data accessible to the affected application can be compromised

Technical summary

The Validator in Progress Kendo UI for jQuery 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. This can lead to JavaScript execution in a user's browser, compromising the confidentiality and integrity of data accessible to the affected application. The issue is fixed in version 2026.3.1015.

Defensive priority

Defenders should prioritize verifying exposure and applying the patch, especially for applications using affected Kendo UI versions.

Recommended defensive actions

• Verify if the application uses an affected version of Kendo UI for jQuery
• Apply the patch to upgrade to version 2026.3.1015 or later
• Review and update validation messages to prevent modification by attackers
• Monitor for suspicious activity related to user input validation
• Perform a thorough review of application code for potential vulnerabilities
• Implement additional security measures to protect against JavaScript injection attacks
• Track and analyze potential security incidents related to this vulnerability

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vulnerability is caused by the Validator decoding validation messages from data-msg-* attributes and parsing the resulting text as HTML. This allows an attacker who can modify a validation message to cause HTML that was correctly escaped in the page attribute to become active markup, including event handlers, when the user triggers validation. There are no known public exploits or reports of this issue.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.