GHSA-hq2x-r82h-9wj4 CVE-2026-102673

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

Medium npm

Severity: 8.2 / 10; Medium · CVSS 3.1
Exploit chance (EPSS): 0.13%; Chance of exploitation in the next 30 days. Higher than 2.76% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-346 Origin Validation Error; CWE-693 Protection Mechanism Failure
Fix: 41.10.4; Upgrade electron to this version or later

Description

Impact

Popups opened from a sandboxed iframe through a link (for example target="_blank" or a middle-click) did not inherit the iframe's HTML sandbox restrictions. Content that was meant to run sandboxed could open a popup with the embedding app's full origin, gaining access to that origin's cookies, storage, and same-origin scripting.

Apps are only affected if they embed untrusted content in iframes sandboxed with allow-scripts allow-popups. Apps that do not embed untrusted content in sandboxed iframes are not affected.

Workarounds

Use setWindowOpenHandler on the parent WebContents to deny or constrain popups opened from sandboxed frames, or do not apply allow-popups to sandboxed iframes that render untrusted content.

Fixed Versions

43.0.0
42.5.2
41.10.4

For more information

If you have any questions or comments about this advisory, email us at security@electronjs.org

Affected versions

npm

Package	Vulnerable	Fixed in
electron	`< 41.10.4`	`41.10.4`
electron	`>= 42.0.0-alpha.1, < 42.5.2`	`42.5.2`
electron	`>= 43.0.0-alpha.1, < 43.0.0`	`43.0.0`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

electron npm → `41.10.4`

npm

npm install electron@41.10.4

yarn

yarn add electron@41.10.4

pnpm

pnpm add electron@41.10.4

Severity breakdown

CVSS 3.1 8.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Changed
Confidentiality: High
Integrity: Low
Availability: None

Weakness

CWE-346: Origin Validation Error

The product does not properly verify that the source of data or communication is valid.

CWE-693: Protection Mechanism Failure

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

References

Packages

github.com/electron/electron

Timeline

Sep 29, 2026 Published
Oct 15, 2026 Last updated by the source
Nov 1, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-qqvq-6xgj-jw8g Electron affected by libvpx's heap buffer overflow in vp8 encoding	High Known exploited	Also affects electron
GHSA-j7hp-h8jx-5ppr libwebp: OOB write in BuildHuffmanTable	High Known exploited	Also affects electron
GHSA-995f-9x5r-2rcj Heap buffer overflow in GPU	Critical Known exploited	Also affects electron
GHSA-jr5w-w6x2-84p9 Electron: Mitigation for compromised eMudhra intermediate certificates	High	Also affects electron
GHSA-h3v5-h239-pg29 Electron: Off-screen rendering on macOS trusts GPU-supplied frame geometry	Low	Also affects electron
GHSA-3qxv-5xgr-q7w9 Electron: Frame subscription trusts GPU-supplied frame geometry	Low	Also affects electron
GHSA-997q-gvvc-jwmx Electron: openExternal permission requests can be attributed to the wrong origin	Medium	Also affects electron
GHSA-fw47-9c62-h3vw Electron: HID and USB permission checks can be attributed to the wrong origin	Medium	Also affects electron

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