CVE-2021-29489

Browser code execution via unsanitized chart options

Published May 5, 2021 · Updated Aug 3, 2024

Cross-site scripting in Highsoft AS Highcharts before 9.0.0 allows attackers to execute JavaScript through untrusted chart options. The rendering layer inserts HTML string options directly into the DOM when useHTML is enabled, while replacement tricks or malformed HTML bypass filtering when it is disabled. Exploitation requires attacker-controlled chart configuration; static, prefiltered, or markup-free configuration is not affected.

CVSS severity7.6
High
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Highsoft AS Highcharts before 9.0.0 allows attackers to execute JavaScript through untrusted chart options. The rendering layer inserts HTML string options directly into the DOM when useHTML is enabled, while replacement tricks or malformed HTML bypass filtering when it is disabled. Exploitation requires attacker-controlled chart configuration; static, prefiltered, or markup-free configuration is not affected.

The record

CVE
CVE-2021-29489
Published
May 5, 2021
Updated
Aug 3, 2024
Vendor
Highsoft AS
Product
Highcharts
Classifications
CWE-79, T1203
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 9.0.0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Highsoft AS · Highchartsversion=< 9.0.0

Published CVSS scores

7.6GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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