CVE-2026-106138 Progress Software CVE debrief

Who should care

Defenders responsible for KendoReact installations, particularly those with user-interactive chart features, should assess exposure and apply necessary patches or mitigations. This includes operators managing KendoReact deployments, platform administrators, vulnerability management teams, and security teams responsible for monitoring and protecting against potential exploitation.

Why it matters

CVE-2026-106138 is a Cross-Site Scripting vulnerability in Progress KendoReact that allows an attacker with low privileges to inject malicious HTML into chart tooltips, potentially leading to JavaScript execution in user browsers. Defenders should assess exposure, particularly for KendoReact installations with user-interactive chart features, and apply patches or mitigations to prevent exploitation. The vulnerability exists in versions from 1.1.0 to prior to 16.2.0.

• Potential for JavaScript execution in user browsers
• Compromise of confidentiality and integrity of accessible data
• Need for patching or mitigation to prevent exploitation
• Verification of KendoReact version and exposure

Technical summary

The default Chart tooltip in Progress KendoReact 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 exists in KendoReact versions from 1.1.0 to prior to 16.2.0, and defenders should prioritize assessing exposure and applying patches or mitigations to prevent exploitation. The vulnerability can compromise the confidentiality and integrity of data accessible to the affected application.

Defensive priority

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

Recommended defensive actions

• Assess exposure of KendoReact installations to this vulnerability
• Apply patches or mitigations to prevent exploitation
• Monitor for suspicious activity related to chart tooltips
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including its existence in KendoReact versions from 1.1.0 to prior to 16.2.0 and the potential for an attacker to inject malicious HTML.

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.