CVE-2026-70608
Impact
A sandboxed iframe without the allow-popups keyword could still open a new window (or trigger setWindowOpenHandler) with no user interaction, because new-window navigations taking the OpenURL path did not apply the iframe sandbox popup restriction.
Apps that embed untrusted content in sandboxed iframes and rely on the absence of allow-popups to prevent window creation are affected. Apps that deny window creation in setWindowOpenHandler, or that do not embed untrusted content in sandboxed iframes, are not affected.
Workarounds
Return { action: 'deny' } from setWindowOpenHandler for any content you do not trust, rather than relying on the iframe sandbox alone.
Fixed Versions
- 42.0.1
- 41.10.3
- 39.8.10
For more information
If you have any questions or comments about this advisory, email Electron at security@electronjs.org
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Advisory coverage (1)
External references
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