CVE-2026-70608: Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path
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.
References
- github.com/advisories/GHSA-9f4c-93c8-jc8g
- github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57
- github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3
- github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f
- github.com/electron/electron/pull/51437
- github.com/electron/electron/pull/51438
- github.com/electron/electron/pull/51439
- github.com/electron/electron/releases/tag/v39.8.10
- github.com/electron/electron/releases/tag/v41.10.3
- github.com/electron/electron/releases/tag/v42.0.1
- github.com/electron/electron/security/advisories/GHSA-9f4c-93c8-jc8g
- nvd.nist.gov/vuln/detail/CVE-2026-70608
Code Behaviors & Features
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