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High, CVSS 8.2amended

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

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

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (electron 43.0.0, 42.5.2, 41.10.4), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm electron

    Affected
    < 41.10.4>= 42.0.0-alpha.1, < 42.5.2>= 43.0.0-alpha.1, < 43.0.0
    Fixed in
    43.0.0, 42.5.2, 41.10.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
EPSS
  • CVE-2026-102673: 0.13% estimated exploitation activity in the next 30 days; percentile 2.79 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-hq2x-r82h-9wj4

  2. Revision 2 · amended ·

    Amended from osv record GHSA-hq2x-r82h-9wj4

  3. Revision 1 · created ·

    Published from ghsa record GHSA-hq2x-r82h-9wj4

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-102673

Advisory: Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab
IDs: CVE-2026-102673, GHSA-hq2x-r82h-9wj4
Record: https://patchnext.com/advisories/cve-2026-102673 (revision 3, source checked 26 Oct 2026, 13:02 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: electron 43.0.0, 42.5.2, 41.10.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm electron: affected < 41.10.4; >= 42.0.0-alpha.1, < 42.5.2; >= 43.0.0-alpha.1, < 43.0.0; fixed in 43.0.0, 42.5.2, 41.10.4

## Suggested inspection (read-only)
- `npm ls electron --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on electron.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hq2x-r82h-9wj4 (GitHub-reviewed advisory GHSA-hq2x-r82h-9wj4 lists affected ranges: npm electron >=0 =42.0.0-alpha.1 =43.0.0-alpha.1 <43.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-hq2x-r82h-9wj4 (OSV record GHSA-hq2x-r82h-9wj4 lists affected ranges: npm electron >=0 =42.0.0-alpha.1 =43.0.0-alpha.1 <43.0.0 (fixed))

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