Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 41.10.3, and 42.0.1, 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, while apps that deny window creation in setWindowOpenHandler or do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in 39.8.10, 41.10.3, and 42.0.1.

Scores

EPSS (exploitation in 30 days)

0.43% · top 63% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Weakness

• CWE-693: Protection Mechanism Failure (opens in a new tab)All about CWE-693 and its CVEs
• CWE-1021: Improper Restriction of Rendered UI Layers or Frames (opens in a new tab)All about CWE-1021 and its CVEs

Affected products

• electron · electron

  • affected < 39.8.10
  • affected >= 40.0.0-alpha.1, < 41.10.3
  • affected >= 42.0.0-alpha.1, < 42.0.1

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• npmelectronGHSA-9f4c-93c8-jc8g (opens in a new tab)

References (10)

• https://github.com/electron/electron/security/advisories/GHSA-9f4c-93c8-jc8g (opens in a new tab)x_refsource_CONFIRM
• https://github.com/electron/electron/pull/51437 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/pull/51438 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/pull/51439 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/releases/tag/v39.8.10 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/releases/tag/v41.10.3 (opens in a new tab)x_refsource_MISC
• https://github.com/electron/electron/releases/tag/v42.0.1 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-9f4c-93c8-jc8g (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-70608](https://trackcve.app/badge/CVE-2026-70608.svg)](https://trackcve.app/cve/CVE-2026-70608)

Record last updated 5 Aug 2026, 18:46 UTC.