CVE-2026-102674
Description
A flaw was found in Electron. Windows opened from a sandboxed top-level document do not inherit that document's active sandbox restrictions. An attacker capable of delivering untrusted content to a sandboxed document can open a popup window that runs with the application's full origin rather than the restricted origin. This can lead to a sandbox bypass, allowing unauthorized access to sensitive application data or internal resources.
Statement
A flaw was found in Electron where child windows opened from a sandboxed top-level document fail to inherit the document's active HTML sandbox restrictions. An attacker capable of delivering untrusted content to a sandboxed document that is permitted to open popups can spawn a window running under the application's full origin. This leads to a sandbox bypass, enabling unauthorized access to sensitive application data or internal resources.
Mitigation
Applications can mitigate this vulnerability by intercepting and denying unexpected popups using setWindowOpenHandler. Returning { action: 'deny' } for unvalidated or unapproved popup requests prevents child windows from opening with the full origin context.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.2 | 6.1 | 8.2 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | Required | Required | Required |
| Scope | Changed | Changed | Changed |
| Confidentiality | High | Low | High |
| Integrity Impact | Low | Low | Low |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity
Technical Impact: Read Application Data; Modify Application Data
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
