High severity · published Aug 5, 2026
CVE-2026-70608
Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path
7.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
electron · electron
< 39.8.10; >= 40.0.0-alpha.1, < 41.10.3; >= 42.0.0-alpha.1, < 42.0.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70608
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70608
Patch
https://github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57
Patch
https://github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3
Patch
https://github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f
Issue Tracking
https://github.com/electron/electron/pull/51437
Issue Tracking
https://github.com/electron/electron/pull/51438
Issue Tracking
https://github.com/electron/electron/pull/51439
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