External risk intelligence

Electron Webview Worker Privilege Escalation

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-102676

Electron is a framework for building local desktop applications. The vulnerability exists within the framework's internal handling of webview tags and worker processes. These applications operate as client-side software on user devices and do not typically function as internet-facing services, gateways, or public-facing network endpoints.

Electronjs Electron

before 41.10.642.0.0 to before 42.9.243.0.0 to before 43.4.144.0.0

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

The Electron framework, used for building cross-platform desktop applications, has a vulnerability where a webview guest could gain elevated privileges for its worker processes, even if the main application had Node.js integration disabled. This could allow untrusted content to execute with higher permissions than intended, impacting applications that utilize the `<webview>` tag without proper sandboxing.

Webview security flaw grants unexpected privileges.
Prevents untrusted content from gaining elevated access.
Confirm relevance and exposure for `<webview>` usage.

Attack Path

How an attacker could exploit the issue

An attacker could potentially leverage a vulnerability within the Electron framework's <webview> component. This flaw allows untrusted content embedded within an application to create a Node.js-enabled worker process, even if the main application has Node.js integration disabled. Such a worker could then operate with elevated privileges beyond what the application intended. Applications that do not use the <webview> tag or keep the embedder sandboxed are not affected.

Untrusted web content within a webview.
Enabling nodeIntegrationInWorker for web workers.
Elevated privileges and potential system compromise.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability in Electron's <webview> component could allow untrusted web content to gain elevated privileges within a desktop application. This could occur when an application uses the <webview> tag and has Node.js integration disabled for the main application process, but the guest <webview> has Node.js integration enabled for its workers. This bypasses the intended sandbox, potentially impacting the security of the application and its users when specific configurations are met.

Application logic and processes at risk.
Untrusted guest content could elevate privileges.
Compromised application behavior or data access.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-world ownership of this Electron framework vulnerability likely falls to application development teams and platform teams responsible for managing desktop application dependencies. The first practical step is to identify all applications utilizing the affected Electron versions, confirm if the `<webview>` tag is in use, and assess business criticality before planning remediation.

Application and platform teams own this.
Verify `<webview>` tag usage.
Plan remediation based on risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Electron and how is it used?

Electron is a software framework that allows developers to build cross-platform desktop applications using familiar web technologies like JavaScript, HTML, and CSS. Many popular desktop tools for messaging, productivity, and media rely on Electron to provide a consistent experience across different operating systems while accessing local system resources.

What is the vulnerability in CVE-2026-102676?

This vulnerability, related to improper privilege management (CWE-269) and potentially insecure default initialization (CWE-1188), allows untrusted content within an Electron application's webview to gain excessive privileges. Specifically, it can enable Node.js integration in Web Workers, granting the guest content more authority than the application intended, effectively bypassing security restrictions placed on the main process.

What triggers this Electron vulnerability?

The issue is triggered when an application utilizes the <webview> tag and allows untrusted guest content to enable Node.js integration for its Web Workers. If an application does not use the <webview> tag, or if the embedder process is properly sandboxed, this vulnerability cannot be exploited.

Do I need to worry about this if I run desktop apps?

According to Halo Surface Signal, this is generally unlikely to pose a high risk for most users. Because Electron powers local desktop applications rather than public-facing network services, it typically does not act as an internet-facing gateway. Your primary concern is whether any specific desktop applications you use or manage rely on the vulnerable <webview> configuration.

How should I respond to this vulnerability?

The first step is for development or platform teams to identify which applications in their environment rely on the affected Electron versions. Once identified, teams should confirm whether those applications utilize the <webview> tag. If the tag is used, planning an update to the patched Electron versions is the recommended path to resolve the security gap.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.