CVE-2026-91860: Software Security Vulnerability Vulnerability
MODERATECVE-2026-91860 is a MODERATE security vulnerability vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-91860 at a Glance
How to Fix CVE-2026-91860
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-91860, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
References
Frequently Asked Questions
What is CVE-2026-91860?
Which Software versions are affected?
What version fixes CVE-2026-91860?
What CWE is associated with CVE-2026-91860?
How can I check Maven dependencies for CVE-2026-91860?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-48v4-h5mw-72ww",
"modified" : "2026-09-30T15:31:33Z",
"published" : "2026-09-30T15:31:33Z",
"aliases" : [ "CVE-2026-91860" ],
"details" : "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.\n\n\nUsers of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:\n\nProduct version\nVaadin 23.0.0 - 23.6.13\nVaadin 24.0.0 - 24.9.20\nVaadin 24.10.0 - 24.10.9\nVaadin 25.0.0 - 25.1.11\nVaadin 25.2.0 - 25.2.6\n\nMitigation\nUpgrade to 23.6.14\nUpgrade to 24.9.21\nUpgrade to 24.10.10\nUpgrade to 25.1.12\nUpgrade to 25.2.7 or newer\n\nPlease 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.\n\nArtifacts\nMaven coordinates Vulnerable versions Fixed version\ncom.vaadin:vaadin 23.0.0 - 23.6.13 >=23.6.14\ncom.vaadin:vaadin 24.0.0 - 24.9.20 >=24.9.21\ncom.vaadin:vaadin 24.10.0 - 24.10.9 >=24.10.10\ncom.vaadin:vaadin 25.0.0 - 25.1.11 >=25.1.12\ncom.vaadin:vaadin 25.2.0 - 25.2.6 >=25.2.7\ncom.vaadin:vaadin-core 24.7.0 - 24.9.20 >=24.9.21\ncom.vaadin:vaadin-core 24.10.0 - 24.10.9 >=24.10.10\ncom.vaadin:vaadin-core 25.0.0 - 25.1.11 >=25.1.12\ncom.vaadin:vaadin-core 25.2.0 - 25.2.6 >=25.2.7\ncom.vaadin:vaadin-charts-flow 23.0.0 - 23.6.13 >=23.6.14\ncom.vaadin:vaadin-charts-flow 24.0.0 - 24.9.20 >=24.9.21\ncom.vaadin:vaadin-charts-flow 24.10.0 - 24.10.9 >=24.10.10\ncom.vaadin:vaadin-charts-flow 25.0.0 - 25.1.11 >=25.1.12\ncom.vaadin:vaadin-charts-flow 25.2.0 - 25.2.6 >=25.2.7\n\nnpm packages\nnpm package Vulnerable versions Fixed version\n@vaadin/charts 23.0.0 - 23.6.4 >=23.6.5\n@vaadin/charts 24.0.0 - 24.9.17 >=24.9.18\n@vaadin/charts 24.10.0 - 24.10.4 >=24.10.5\n@vaadin/charts 25.0.0 - 25.1.11 >=25.1.12\n@vaadin/charts 25.2.0 - 25.2.8 >=25.2.9\n@vaadin/component-base 24.7.0 - 24.9.17 >=24.9.18\n@vaadin/component-base 24.10.0 - 24.10.4 >=24.10.5\n@vaadin/component-base 25.0.0 - 25.1.11 >=25.1.12\n@vaadin/component-base 25.2.0 - 25.2.8 >=25.2.9",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-91860"
}, {
"type" : "WEB",
"url" : "https://github.com/vaadin/web-components/pull/12483"
}, {
"type" : "WEB",
"url" : "https://github.com/vaadin/web-components/pull/12492"
}, {
"type" : "WEB",
"url" : "https://github.com/vaadin/web-components/pull/12493"
}, {
"type" : "WEB",
"url" : "https://github.com/vaadin/web-components/pull/12494"
}, {
"type" : "WEB",
"url" : "https://github.com/vaadin/web-components/pull/12496"
}, {
"type" : "WEB",
"url" : "https://github.com/vaadin/web-components/pull/12559"
}, {
"type" : "WEB",
"url" : "https://vaadin.com/security/cve-2026-91860"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-1321" ],
"severity" : "MODERATE",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-09-30T14:17:34Z"
}
}