Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was not subject to CORS enforcement. A page loaded from a remote origin could therefore fetch() or XMLHttpRequest that scheme cross-origin and read the full response body, rather than the read being blocked. Apps that serve sensitive data from such a scheme and load remote or untrusted content in a renderer are affected. This issue is fixed in versions 39.8.10, 40.9.3, 41.4.0, and 42.0.0.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
CVE-2026-70604 Cross-Origin Request Vulnerability in Electron Custom Schemes Before 42.0.0 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-70604
Post summary
The text references CVE‑2026‑70604 and gives a brief vulnerability description, but provides no additional details, PoC, exploit code, or mitigation information.
🚨High - Electron Custom Scheme CORS Bypass via supportFetchAPI (CVE-2026-70604) Electron custom schemes registered with supportFetchAPI: true but without corsEnabled bypass CORS enforcement. Remote/untrusted renderer pages can use fetch()/XMLHttpRequest to read full response bodies from the scheme cross-origin, leaking sensitive app data. Schemes with corsEnabled are not affected. 👉Affected: electron < 39.8.10, 40.x < 40.9.3, 41.x < 41.4.0, 42.x < 42.0.0 | Upgrade to 39.8.10/40.9.3/41.4.0/42.0.0
Post summary
The post discloses a high‑severity CORS bypass in Electron, offers technical details, and recommends patching to fixed versions.