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Electron: Cross-origin iframe can position native autofill popup

Low severity GitHub Reviewed Published Jul 27, 2026 in electron/electron • Updated Aug 5, 2026

Package

npm electron (npm)

Affected versions

< 39.8.8
>= 40.0.0-alpha.1, < 40.9.0
>= 41.0.0-alpha.1, < 41.2.1
>= 42.0.0-alpha.1, < 42.0.0-beta.3

Patched versions

39.8.8
40.9.1
41.2.1
42.0.0-beta.3

Description

Impact

The native autofill popup could be positioned by a cross-origin iframe outside that iframe's bounds, over the embedding page's UI, enabling clickjacking or spoofing of trusted UI.

Apps are only affected if they embed untrusted content in iframes within windows that also display trusted UI. Apps that do not embed untrusted third-party content are not affected.

Workarounds

Do not embed untrusted content in iframes inside windows that display trusted UI.

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

References

@MarshallOfSound MarshallOfSound published to electron/electron Jul 27, 2026
Published to the GitHub Advisory Database Aug 5, 2026
Reviewed Aug 5, 2026
Last updated Aug 5, 2026

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

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

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(4th percentile)

Weaknesses

Improper Restriction of Rendered UI Layers or Frames

The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain, which can lead to user confusion about which interface the user is interacting with. Learn more on MITRE.

CVE ID

CVE-2026-70600

GHSA ID

GHSA-x8rc-wpg4-grpf

Source code

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