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CVE-2026-34778— Electron: Service worker can spoof executeJavaScript IPC replies

Quick assessment

Affected
electron electron
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Electron是Electron开源的一个用户编写跨平台桌面应用的 JavaScript 框架。该框架基于 nodejs 和 Chromium 可以使用HTML，CSS实现跨平台桌面应用的编写。 Electron 38.8.6之前版本、39.8.1之前版本、40.8.1之前版本和41.0.0之前版本存在数据伪造问题漏洞，该漏洞源于会话中运行的服务工作线程可能欺骗webContents.executeJavaScript及相关方法使用的内部IPC通道上的回复消息，可能导致主进程承诺解析为攻击者控制的数据。

CVSS 5.9 · Medium EPSS 0.14% · P3
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I. Basic Information for CVE-2026-34778

Vulnerability Information
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Vulnerability Title
Electron: Service worker can spoof executeJavaScript IPC replies
Source: CVE Program / CVE List V5
Vulnerability Description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Electron 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Electron是Electron开源的一个用户编写跨平台桌面应用的 JavaScript 框架。该框架基于 nodejs 和 Chromium 可以使用HTML，CSS实现跨平台桌面应用的编写。 Electron 38.8.6之前版本、39.8.1之前版本、40.8.1之前版本和41.0.0之前版本存在数据伪造问题漏洞，该漏洞源于会话中运行的服务工作线程可能欺骗webContents.executeJavaScript及相关方法使用的内部IPC通道上的回复消息，可能导致主进程承诺解析为攻击者控制的数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
electron electron < 38.8.6 -

II. Public POCs for CVE-2026-34778

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III. Intelligence Information for CVE-2026-34778

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Vendor Advisories for CVE-2026-34778 (1)

Same Patch Batch · electron · 2026-04-03 · 13 CVEs total

CVE-2026-34774 8.1 HIGH Electron: Use-after-free in offscreen child window paint callback
CVE-2026-34769 7.8 HIGH Electron: Renderer command-line switch injection via undocumented commandLineSwitches webP
CVE-2026-34771 7.5 HIGH Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permis
CVE-2026-34770 7.0 HIGH Electron: Use-after-free in PowerMonitor on Windows and macOS
CVE-2026-34775 6.8 MEDIUM Electron: nodeIntegrationInWorker not correctly scoped in shared renderer processes
CVE-2026-34767 5.9 MEDIUM Electron: HTTP Response Header Injection in custom protocol handlers and webRequest
CVE-2026-34772 5.8 MEDIUM Electron: Use-after-free in download save dialog callback
CVE-2026-34777 5.4 MEDIUM Electron: Incorrect origin passed to permission request handler for iframe requests
CVE-2026-34776 5.3 MEDIUM Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
CVE-2026-34773 4.7 MEDIUM Electron: Registry key path injection in app.setAsDefaultProtocolClient on Windows
CVE-2026-34768 3.9 LOW Electron: Unquoted executable path in app.setLoginItemSettings on Windows
CVE-2026-34766 3.3 LOW Electron: USB device selection not validated against filtered device list

IV. Related Vulnerabilities

Same product: electron
Same vendor: electron
Same weakness: CWE-290

V. Comments for CVE-2026-34778

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