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

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

electron electronnpmRuntimes & languages
Open in ThreatlineRecord JSON
CVSS
8.2High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in41.10.4Also 42.5.2, 43.0.0GitHub
Published29 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

  • 41.10.4electron, npmGitHubnpm install electron@41.10.4
  • 42.5.2electron, npmGitHubnpm install electron@42.5.2
  • 43.0.0electron, npmGitHubnpm install electron@43.0.0

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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](mailto:security@electronjs.org)

Text from GitHub Advisory Database

Affected versions 9

  • electron, npm< 41.10.4GitHub
  • electron, npm>= 42.0.0-alpha.1, < 42.5.2GitHub
  • electron, npm>= 43.0.0-alpha.1, < 43.0.0GitHub
  • electronaffected: < 41.10.4CVE List
  • electronaffected: >= 42.0.0-alpha.1, < 42.5.2CVE List
  • electronaffected: >= 43.0.0-alpha.1, < 43.0.0CVE List
  • electron, npmfrom first release, fixed in 41.10.4OSV
  • electron, npmfrom 42.0.0-alpha.1, fixed in 42.5.2OSV
  • electron, npmfrom 43.0.0-alpha.1, fixed in 43.0.0OSV

References 9