CVE-2026-106139 Progress Software CVE debrief

Who should care

Defenders responsible for Kendo UI for Vue installations, particularly those with user-generated or dynamic chart data, should assess exposure and take action to prevent exploitation.

Why it matters

CVE-2026-106139 is a Cross-Site Scripting vulnerability in Kendo UI for Vue that allows an attacker with low privileges to inject malicious HTML and JavaScript. Defenders should assess exposure, prioritize patching, and verify input validation and data encoding to prevent exploitation and protect data confidentiality and integrity.

• Data confidentiality and integrity compromise
• Potential for unauthorized JavaScript execution
• Need for input validation and data encoding verification
• Prioritization of patching or workarounds for affected systems

Technical summary

The default Chart tooltip in Progress Kendo UI for Vue renders formatted point values as raw HTML without encoding. An attacker with low privileges can influence string values bound to the chart to supply HTML containing event handlers that execute JavaScript in a user's browser when hovering over the affected data point. This vulnerability affects Kendo UI for Vue versions 2.5.0 to 16.2.0. Successful exploitation can compromise the confidentiality and integrity of data accessible to the affected application. Defenders should prioritize assessing exposure and applying patches or workarounds to prevent exploitation.

Defensive priority

Defenders should prioritize assessing exposure and applying patches or workarounds to prevent exploitation.

Recommended defensive actions

• Assess exposure of Kendo UI for Vue installations to this vulnerability
• Apply patches or workarounds provided by the vendor
• Monitor for suspicious activity related to chart tooltips
• Verify user input validation and data encoding in chart configurations
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the vulnerability, including its existence in Kendo UI for Vue versions 2.5.0 to 16.2.0. However, additional information on exploitation or affected systems is limited.

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.