Bug 2455025 (CVE-2026-34773)

Summary: CVE-2026-34773 electron: Electron: Protocol handler hijacking via improper validation of protocol names
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Electron, a framework for building desktop applications. On Windows, the `app.setAsDefaultProtocolClient()` function did not properly validate protocol names before writing to the system registry. This vulnerability could allow a local attacker, through an application that processes untrusted input, to write to arbitrary registry subkeys. Consequently, an attacker might be able to hijack existing protocol handlers, leading to unintended program execution or other system modifications.
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Description OSIDB Bzimport 2026-04-04 01:01:32 UTC 
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, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol name before writing to the registry. Apps that pass untrusted input as the protocol name may allow an attacker to write to arbitrary subkeys under HKCU\Software\Classes\, potentially hijacking existing protocol handlers. Apps are only affected if they call app.setAsDefaultProtocolClient() with a protocol name derived from external or untrusted input. Apps that use a hardcoded protocol name are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.