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CVE-2026-70608

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

HIGH
7.2
CVSS Score
Published: August 5, 2026 at 05:27 PM UTC
Updated: October 8, 2026 at 01:53 PM UTC
2 products affected across 2 vendorsElectronElectron

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Severity
HIGH7.2
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Electron· Electronjsnpm
95%
v < 39.8.840.0.0 ≤ v < 41.10.342.0.0 ≤ v < 42.0.1*
Affected range stops below 39.8.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 41.10.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 42.0.1, so it looks safe — our inference, not a vendor statement
Electron· Electron
90%
v < 39.8.10>= 40.0.0-alpha.1, < 41.10.3>= 42.0.0-alpha.1, < 42.0.1
Affected range stops below 39.8.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 41.10.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 42.0.1, so it looks safe — our inference, not a vendor statement

References (10)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/electron/electron/security/advisories/GHSA-9f4c-93c8-jc8g
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/electron/electron/pull/51437
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/electron/electron/pull/51438
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/electron/electron/pull/51439
x_refsource_MISCPatch
Source: cverecord
https://github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57
x_refsource_MISCPatch
Source: cverecord
https://github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3
x_refsource_MISCPatch
Source: cverecord
https://github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/electron/electron/releases/tag/v39.8.10

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-693CWE-1021

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