Vulnerability in electron (CVE-2026-102673)
Summary
Vulnerability in electron (CVE-2026-102673). Confidential information can be exposed externally. Exploitable via sandbox. Mitigation: upgrade to 43.0.0 or later.
Original description
The description as published by the source.
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
43.0.042.5.241.10.4
For more information
If you have any questions or comments about this advisory, email us at security@electronjs.org
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-102673 has been found in electron.
Attackers can target a specific entry point like sandbox over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade electron to 43.0.0 or later.
If unsure, ask your IT team or search "electron CVE-2026-102673" on the vendor's site.
CVE-2026-102673 (electron) — CWE-346 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: sandbox / setWindowOpenHandler / WebContents
Patched: 43.0.0 — apply immediately
Workaround: 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.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-346) exists in electron. Attackers reach the vulnerable code path via sandbox without authentication.
Check the vendor advisory for the affected versions of electron. Attack surface: sandbox / setWindowOpenHandler / WebContents.
Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.
Update to 43.0.0.
Workaround: 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.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'electron' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'electron' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
electronを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
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.パッチが適用されるまでの応急処置として、Use
setWindowOpenHandleron the parentWebContentsto deny or constrain popups opened from sandboxed frames, or do not applyallow-popupsto sandboxed iframes that render untrusted content. を実施。回避策の副作用 (機能低下) を確認した上で。 -
3Apply patch patch
Upgrade electron to 43.0.0ステージング環境で 43.0.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
4Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- web security-advisories@github.com
- web security-advisories@github.com
- web github.com