MediumGHSA-p2rr-rvmm-c5fpCVE-2026-70612

Electron: Sandboxed iframes can launch external protocol handlers

Published 5 Aug 2026 · Updated 5 Aug 2026

Affected packages

electronnpm

Affected: <39.8.8
Fixed in: 39.8.8

Update to the fixed version for your release line, for example:npm install electron@39.8.8

electronnpm

Affected: >=40.0.0-alpha.1 <40.9.0
Fixed in: 40.9.0

Update to the fixed version for your release line, for example:npm install electron@40.9.0

electronnpm

Affected: >=41.0.0-alpha.1 <41.2.1
Fixed in: 41.2.1

Update to the fixed version for your release line, for example:npm install electron@41.2.1

electronnpm

Affected: >=42.0.0-alpha.1 <42.0.0-beta.3
Fixed in: 42.0.0-beta.3

Update to the fixed version for your release line, for example:npm install electron@42.0.0-beta.3

Details

Impact

Requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could cause an OS-registered external application to be launched. The frame's sandbox state was also not made available to the app's permission handlers.

Apps are only affected if they render untrusted content in sandboxed iframes and grant the openExternal permission (granted by default when no setPermissionRequestHandler is installed). Apps whose permission handler denies openExternal for untrusted content are not affected.

Workarounds

Install a setPermissionRequestHandler that denies the openExternal permission for untrusted content.

Fixed Versions

42.0.0-beta.3
41.2.1
40.9.0
39.8.8

For more information

If you have any questions or comments about this advisory, email Electron 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.