CVE-2026-102673 — Vulnerability in electron — CVE Details

HIGH

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

Published September 29, 2026Updated September 29, 2026Source: osv

Summary

### 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)

Advisory Timeline

First published September 29, 2026 (13 days ago).
Last revised September 29, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update electron to 43.0.0 or later

npm install electron@43.0.0

npm

Update electron to 42.5.2 or later

npm install electron@42.5.2

npm

Update electron to 41.10.4 or later

npm install electron@41.10.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: npm (1).

Package	Ecosystem	Affected	Fixed In
electron	npm	All versions	43.0.0
electron	npm	All versions	42.5.2
electron	npm	All versions	41.10.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-346
Origin Validation ErrorMITRE
CWE-693
Protection Mechanism FailureMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.2 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References

Frequently Asked Questions

What is CVE-2026-102673?: Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.2/10).
How do I check if my project is affected by CVE-2026-102673?: CVE-2026-102673 affects electron. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-102673 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

8.2

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-hq2x-r82h-9wj4

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