CVE-2026-118242
Description
A flaw was found in Highcharts. When rendering grid icons using Scalable Vector Graphics (SVG), the library copies configuration properties directly into element attributes without proper sanitization. An attacker who controls the grid configuration can supply malicious event handlers within custom icon definitions. When a user hovers over or activates an affected icon, arbitrary script executes within their browser session, potentially enabling sensitive information disclosure or unauthorized actions.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires an attacker to inject untrusted configuration objects into Highcharts Grid and relies on user interaction to execute script within the user's browser origin. In standard Red Hat product deployments, chart and grid configurations are not directly exposed to unauthenticated or untrusted input. Consequently, the practical risk is limited to applications where untrusted users can manipulate grid configuration structures without prior server-side sanitization.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.4 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Changed | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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