Electron up to 38.8.5/39.8.2/40.8.2/41.0.2 Content Security Policy protocol.handle injection

Summaryinfo

A vulnerability has been found in Electron up to 38.8.5/39.8.2/40.8.2/41.0.2 and classified as problematic. Impacted is the function protocol.handle of the component Content Security Policy Handler. Performing a manipulation results in injection. This vulnerability is cataloged as CVE-2026-34767. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Electron up to 38.8.5/39.8.2/40.8.2/41.0.2. This affects the function protocol.handle of the component Content Security Policy Handler. The manipulation with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on integrity. The summary by CVE is:

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3, apps that register custom protocol handlers via protocol.handle() / protocol.registerSchemesAsPrivileged() or modify response headers via webRequest.onHeadersReceived may be vulnerable to HTTP response header injection if attacker-controlled input is reflected into a response header name or value. An attacker who can influence a header value may be able to inject additional response headers, affecting cookies, content security policy, or cross-origin access controls. Apps that do not reflect external input into response headers are not affected. This issue has been patched in versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-34767 since 03/30/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

Upgrading to version 38.8.6, 39.8.3, 40.8.3 or 41.0.3 eliminates this vulnerability.

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Productinfo

Name

• Electron

Version

• 38.8.0
• 38.8.1
• 38.8.2
• 38.8.3
• 38.8.4
• 38.8.5
• 39.8.0
• 39.8.1
• 39.8.2
• 40.8.0
• 40.8.1
• 40.8.2
• 41.0.0
• 41.0.1
• 41.0.2

Website

• Product: https://github.com/electron/electron/

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