CVE-2021-4325Public exploitNetwork attack vector

Script execution via unsanitized legend series names

Published Feb 22, 2023 · Updated Mar 12, 2025

Cross-site scripting in NHN Cloud TOAST UI Chart 4.1.4 allows attackers to execute script through a crafted chart series name. The legend renderer inserts the series name into generated HTML without sanitizing dangerous tags or event-handler attributes before browser rendering. An application must pass attacker-controlled series data to a chart and a user must render it; the injected script then runs in that application's browser origin.

CVSS severity3.5
Low
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in NHN Cloud TOAST UI Chart 4.1.4 allows attackers to execute script through a crafted chart series name. The legend renderer inserts the series name into generated HTML without sanitizing dangerous tags or event-handler attributes before browser rendering. An application must pass attacker-controlled series data to a chart and a user must render it; the injected script then runs in that application's browser origin.

The record

CVE
CVE-2021-4325
Published
Feb 22, 2023
Updated
Mar 12, 2025
Vendor
NHN Cloud
Product
TOAST UI Chart
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NHN Cloud · TOAST UI Chartversion=4.1.4

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo