CVE-2026-91860 PUBLISHED

Prototype Pollution in Vaadin Charts and Component Base via Unfiltered Deep Merge

Assigner: Vaadin
Reserved: 15.09.2026 Published: 30.09.2026 Updated: 30.09.2026

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

Metrics

CVSS Vector: 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
CVSS Score: 6.3

Product Status

Vendor vaadin
Product vaadin
Versions Default: unaffected
  • affected from 23.0.0 to 23.6.14 (excl.)
  • affected from 24.0.0 to 24.9.21 (excl.)
  • affected from 24.10.0 to 24.10.10 (excl.)
  • affected from 25.0.0 to 25.1.12 (excl.)
  • affected from 25.2.0 to 25.2.7 (excl.)
Vendor vaadin
Product vaadin-core
Versions Default: unaffected
  • affected from 24.7.0 to 24.9.21 (excl.)
  • affected from 24.10.0 to 24.10.10 (excl.)
  • affected from 25.0.0 to 25.1.12 (excl.)
  • affected from 25.2.0 to 25.2.7 (excl.)
Vendor vaadin
Product vaadin-charts-flow
Versions Default: unaffected
  • affected from 23.0.0 to 23.6.14 (excl.)
  • affected from 24.0.0 to 24.9.21 (excl.)
  • affected from 24.10.0 to 24.10.10 (excl.)
  • affected from 25.0.0 to 25.1.12 (excl.)
  • affected from 25.2.0 to 25.2.7 (excl.)
Vendor vaadin
Product @vaadin/charts
Versions Default: unaffected
  • affected from 23.0.0 to 23.6.5 (excl.)
  • affected from 24.0.0 to 24.9.18 (excl.)
  • affected from 24.10.0 to 24.10.5 (excl.)
  • affected from 25.0.0 to 25.1.12 (excl.)
  • affected from 25.2.0 to 25.2.9 (excl.)
Vendor vaadin
Product @vaadin/component-base
Versions Default: unaffected
  • affected from 24.7.0 to 24.9.18 (excl.)
  • affected from 24.10.0 to 24.10.5 (excl.)
  • affected from 25.0.0 to 25.1.12 (excl.)
  • affected from 25.2.0 to 25.2.9 (excl.)

Solutions

Users of affected versions should apply the following mitigation or upgrade.

Credits

  • Ridwan Arefin Islam, Madiba Security Lab, Concordia University finder

References

Problem Types

  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') CWE

Impacts

  • CAPEC-77 Manipulating User-Controlled Variables