---
id: CVE-2026-91860
title: >-
  A prototype pollution vulnerability exists in the deep merge helpers of Vaadin
  Charts and Vaadin Component Base
summary: >-
  A prototype pollution vulnerability exists in the deep merge helpers of Vaadin
  Charts and Vaadin Component Base. Merging an object the application does not
  control into a chart configuration or into a component's i18n property writes
  ont…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'
cwe:
  - CWE-1321
vendor: vaadin
product: 'com.vaadin:vaadin'
affected:
  - 'com.vaadin:vaadin >= 23.0.0 < 23.6.14'
  - 'com.vaadin:vaadin >= 24.0.0 < 24.9.21'
  - 'com.vaadin:vaadin >= 24.10.0 < 24.10.10'
  - 'com.vaadin:vaadin >= 25.0.0 < 25.1.12'
  - 'com.vaadin:vaadin >= 25.2.0 < 25.2.7'
  - 'com.vaadin:vaadin-core >= 24.7.0 < 24.9.21'
  - 'com.vaadin:vaadin-core >= 24.10.0 < 24.10.10'
  - 'com.vaadin:vaadin-core >= 25.0.0 < 25.1.12'
  - 'com.vaadin:vaadin-core >= 25.2.0 < 25.2.7'
  - 'com.vaadin:vaadin-charts-flow >= 23.0.0 < 23.6.14'
  - 'com.vaadin:vaadin-charts-flow >= 24.0.0 < 24.9.21'
  - 'com.vaadin:vaadin-charts-flow >= 24.10.0 < 24.10.10'
  - 'com.vaadin:vaadin-charts-flow >= 25.0.0 < 25.1.12'
  - 'com.vaadin:vaadin-charts-flow >= 25.2.0 < 25.2.7'
  - '@vaadin/charts >= 23.0.0 < 23.6.5'
  - '@vaadin/charts >= 24.0.0 < 24.9.18'
  - '@vaadin/charts >= 24.10.0 < 24.10.5'
  - '@vaadin/charts >= 25.0.0 < 25.1.12'
  - '@vaadin/charts >= 25.2.0 < 25.2.9'
  - '@vaadin/component-base >= 24.7.0 < 24.9.18'
  - '@vaadin/component-base >= 24.10.0 < 24.10.5'
  - '@vaadin/component-base >= 25.0.0 < 25.1.12'
  - '@vaadin/component-base >= 25.2.0 < 25.2.9'
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T15:22:36.293'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91860'
references:
  - url: 'https://github.com/vaadin/web-components/pull/12483'
    label: security@vaadin.com
  - url: 'https://github.com/vaadin/web-components/pull/12492'
    label: security@vaadin.com
  - url: 'https://github.com/vaadin/web-components/pull/12493'
    label: security@vaadin.com
  - url: 'https://github.com/vaadin/web-components/pull/12494'
    label: security@vaadin.com
  - url: 'https://github.com/vaadin/web-components/pull/12496'
    label: security@vaadin.com
  - url: 'https://github.com/vaadin/web-components/pull/12559'
    label: security@vaadin.com
  - url: 'https://vaadin.com/security/cve-2026-91860'
    label: security@vaadin.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T14:26:16.234947Z'
cvssSource: cna
ingestedAt: '2026-09-30T14:05:17.368Z'
---

## Overview

A prototype pollution vulnerability exists in the deep merge helpers of Vaadin Charts and Vaadin Component Base. Merging an object the application does not control into a chart configuration or into a component's i18n property writes onto Object.prototype, making the injected properties visible to every object in the running application.


Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:

Product version
Vaadin 23.0.0 - 23.6.13
Vaadin 24.0.0 - 24.9.20
Vaadin 24.10.0 - 24.10.9
Vaadin 25.0.0 - 25.1.11
Vaadin 25.2.0 - 25.2.6

Mitigation
Upgrade to 23.6.14
Upgrade to 24.9.21
Upgrade to 24.10.10
Upgrade to 25.1.12
Upgrade to 25.2.7 or newer

Please note that Vaadin versions 10-13 and 15-22 are no longer supported and you should update either to the latest 23, 24, 25 version.

Artifacts
Maven coordinates Vulnerable versions Fixed version
com.vaadin:vaadin 23.0.0 - 23.6.13 >=23.6.14
com.vaadin:vaadin 24.0.0 - 24.9.20 >=24.9.21
com.vaadin:vaadin 24.10.0 - 24.10.9 >=24.10.10
com.vaadin:vaadin 25.0.0 - 25.1.11 >=25.1.12
com.vaadin:vaadin 25.2.0 - 25.2.6 >=25.2.7
com.vaadin:vaadin-core 24.7.0 - 24.9.20 >=24.9.21
com.vaadin:vaadin-core 24.10.0 - 24.10.9 >=24.10.10
com.vaadin:vaadin-core 25.0.0 - 25.1.11 >=25.1.12
com.vaadin:vaadin-core 25.2.0 - 25.2.6 >=25.2.7
com.vaadin:vaadin-charts-flow 23.0.0 - 23.6.13 >=23.6.14
com.vaadin:vaadin-charts-flow 24.0.0 - 24.9.20 >=24.9.21
com.vaadin:vaadin-charts-flow 24.10.0 - 24.10.9 >=24.10.10
com.vaadin:vaadin-charts-flow 25.0.0 - 25.1.11 >=25.1.12
com.vaadin:vaadin-charts-flow 25.2.0 - 25.2.6 >=25.2.7

npm packages
npm package Vulnerable versions Fixed version
@vaadin/charts 23.0.0 - 23.6.4 >=23.6.5
@vaadin/charts 24.0.0 - 24.9.17 >=24.9.18
@vaadin/charts 24.10.0 - 24.10.4 >=24.10.5
@vaadin/charts 25.0.0 - 25.1.11 >=25.1.12
@vaadin/charts 25.2.0 - 25.2.8 >=25.2.9
@vaadin/component-base 24.7.0 - 24.9.17 >=24.9.18
@vaadin/component-base 24.10.0 - 24.10.4 >=24.10.5
@vaadin/component-base 25.0.0 - 25.1.11 >=25.1.12
@vaadin/component-base 25.2.0 - 25.2.8 >=25.2.9

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.