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CVE-2026-70612 medium CVSS 5.4

Vulnerability in electron (CVE-2026-70612)

Summary

Vulnerability in electron (CVE-2026-70612). Risk of unauthorized operations or information disclosure. Exploitable via openExternal. Mitigation: upgrade to 42.0.0-beta.3 or later.

Original description

The description as published by the source.

Impact

Requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could cause an OS-registered external application to be launched. The frame's sandbox state was also not made available to the app's permission handlers.

Apps are only affected if they render untrusted content in sandboxed iframes and grant the openExternal permission (granted by default when no setPermissionRequestHandler is installed). Apps whose permission handler denies openExternal for untrusted content are not affected.

Workarounds

Install a setPermissionRequestHandler that denies the openExternal permission for untrusted content.

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

Source: GitHub Security Advisories (Global) 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-2026-70612 has been found in electron.
Attackers can target a specific entry point like openExternal over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.4/10.
What to do: upgrade electron to 42.0.0-beta.3 or later.
If unsure, ask your IT team or search "electron CVE-2026-70612" on the vendor's site.

CVE-2026-70612 (electron) — CWE-284 / CVSS v3 5.4
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: openExternal / setPermissionRequestHandler
Patched: 42.0.0-beta.3 — apply immediately
Workaround: Install a setPermissionRequestHandler that denies the openExternal permission for 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.

❓ What is the problem

A vulnerability (CWE-284) exists in electron. Attackers reach the vulnerable code path via openExternal without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of electron. Attack surface: openExternal / setPermissionRequestHandler.

🔥 Severity

Severity: Medium (CVSS 5.4/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 42.0.0-beta.3.

🛡️ Workaround

Workaround: Install a setPermissionRequestHandler that denies the openExternal permission for untrusted content.

🔍 Detection

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

  1. 1
    Identify 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。

  2. 2
    Apply temporary workaround mitigate 
    Install a `setPermissionRequestHandler` that denies the `openExternal` permission for untrusted content.

    パッチが適用されるまでの応急処置として、Install a setPermissionRequestHandler that denies the openExternal permission for untrusted content. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade electron to 42.0.0-beta.3

    ステージング環境で 42.0.0-beta.3 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。

  4. 4
    Post-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

npm electron
[{"type":"SEMVER","events":[{"introduced":"42.0.0-alpha.1"},{"fixed":"42.0.0-beta.3"}]}]

References

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