HighGHSA-hq2x-r82h-9wj4CVE-2026-102673

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

Published 29 Sept 2026 · Updated 29 Sept 2026

Affected packages

electronnpm

Affected: <41.10.4
Fixed in: 41.10.4

Update to the fixed version for your release line, for example:npm install electron@41.10.4

electronnpm

Affected: >=42.0.0-alpha.1 <42.5.2
Fixed in: 42.5.2

Update to the fixed version for your release line, for example:npm install electron@42.5.2

electronnpm

Affected: >=43.0.0-alpha.1 <43.0.0
Fixed in: 43.0.0

Update to the fixed version for your release line, for example:npm install electron@43.0.0

Details

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](mailto:security@electronjs.org)

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.