CVE-2026-1513 Overview
CVE-2026-1513 is a Cross-Site Scripting (XSS) vulnerability discovered in billboard.js, a popular JavaScript charting library. The vulnerability exists in versions prior to 3.18.0 and allows attackers to execute malicious JavaScript code due to improper sanitization during chart option binding.
Critical Impact
Attackers can execute arbitrary JavaScript in the context of a victim's browser session, potentially leading to session hijacking, credential theft, or malicious content injection.
Affected Products
- billboard.js versions prior to 3.18.0
Discovery Timeline
- 2026-01-28 - CVE CVE-2026-1513 published to NVD
- 2026-01-29 - Last updated in NVD database
Technical Details for CVE-2026-1513
Vulnerability Analysis
This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The flaw resides in how billboard.js processes and binds chart configuration options.
When chart options are passed to the billboard.js library, the input is not properly sanitized before being rendered in the DOM. This allows an attacker to craft malicious input containing JavaScript code that will be executed when the chart is rendered in a user's browser.
The attack requires user interaction, as a victim must load a page containing a chart with attacker-controlled configuration options. The vulnerability has a changed scope, meaning the vulnerable component and impacted component are different—the JavaScript library processes the input, but the victim's browser is where the code executes.
Root Cause
The root cause of this vulnerability is insufficient input validation and output encoding during the chart option binding process. When user-supplied or externally-sourced data is used to configure chart elements (such as titles, labels, tooltips, or callbacks), billboard.js fails to properly sanitize this content before inserting it into the DOM.
This oversight allows attackers to inject HTML elements containing event handlers or script tags that execute arbitrary JavaScript code.
Attack Vector
The attack vector is network-based, requiring an attacker to inject malicious content through chart configuration options. This can occur in several scenarios:
- Applications that allow users to customize chart titles, labels, or other text elements
- Data sources that include unsanitized strings rendered by the charting library
- URL parameters or form inputs that influence chart configuration
When a victim visits a page containing a chart with malicious configuration, the injected script executes in their browser context with the same privileges as the legitimate application.
For technical details on exploitation, refer to the Naver CVE-2026-1513 Details advisory.
Detection Methods for CVE-2026-1513
Indicators of Compromise
- Unusual JavaScript execution originating from billboard.js chart elements
- Chart configurations containing script tags, event handlers (such as onerror, onload, onclick), or encoded JavaScript
- Unexpected network requests to external domains triggered during chart rendering
Detection Strategies
- Implement Content Security Policy (CSP) headers to detect and block inline script execution
- Monitor web application firewall (WAF) logs for XSS patterns in requests targeting charting endpoints
- Use static application security testing (SAST) tools to identify vulnerable billboard.js versions in codebases
- Conduct regular dependency audits using tools like npm audit or Snyk to identify vulnerable package versions
Monitoring Recommendations
- Enable browser-side XSS detection and reporting via CSP report-uri directive
- Monitor application logs for suspicious input patterns containing HTML or JavaScript syntax in chart configuration parameters
- Implement runtime application self-protection (RASP) to detect XSS attempts in real-time
How to Mitigate CVE-2026-1513
Immediate Actions Required
- Upgrade billboard.js to version 3.18.0 or later immediately
- Audit all chart configurations that accept user-controlled or external data inputs
- Implement server-side input validation and HTML entity encoding for all chart configuration values
- Deploy Content Security Policy (CSP) headers to restrict inline script execution
Patch Information
The vulnerability has been addressed in billboard.js version 3.18.0. Organizations should update their dependencies by running the appropriate package manager command for their environment. After updating, verify the installed version meets or exceeds 3.18.0 by checking the package manifest.
Additional details are available in the Naver CVE-2026-1513 Details advisory.
Workarounds
- Implement strict Content Security Policy headers that disallow inline scripts and unsafe-eval
- Sanitize all user-supplied input before passing it to billboard.js configuration options using a library like DOMPurify
- Avoid rendering user-controlled data in chart titles, labels, tooltips, or callback functions without proper encoding
# Update billboard.js to patched version
npm update billboard.js@^3.18.0
# Verify installed version
npm list billboard.js
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
