CVE-2026-70607

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, some window options supplied by web content in the window.open() features string were applied to the new BrowserWindow without an allowlist. Untrusted content could set window options it should not control, including options that cause the main process to access attacker-chosen file or network paths, when untrusted content can call window.open() and the app does not override child window options via setWindowOpenHandler or overrideBrowserWindowOptions. This issue is fixed in 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 5, 2026

Advisory Details (10)

Auto-updated Aug 5, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

electron v39.8.8

Patch available: electron/electron v39.8.8

https://github.com/electron/electron/releases/tag/v39.8.8
github_commit

commit fe2e7d007394 (electron/electron)

Fix landed in electron/electron commit fe2e7d007394 — awaiting tagged release

https://github.com/electron/electron/commit/fe2e7d0073949b4593b624b93abf1788f5377e55
github_commit

commit 615d62500fc7 (electron/electron)

Fix landed in electron/electron commit 615d62500fc7 — awaiting tagged release

https://github.com/electron/electron/commit/615d62500fc7732d068274b796c49487e652e90b
github_commit

commit 4eff3dc09e4d (electron/electron)

Fix landed in electron/electron commit 4eff3dc09e4d — awaiting tagged release

https://github.com/electron/electron/commit/4eff3dc09e4d1e62d649c5ce9902f532bb7469c7
github_commit

commit 30cf3882de75 (electron/electron)

Fix landed in electron/electron commit 30cf3882de75 — awaiting tagged release

https://github.com/electron/electron/commit/30cf3882de75ee651bd4e5f27002f13fd3d3163a
github_pr

fix: restrict window.open features to allowlisted BrowserWindow options

Fix merged in electron/electron PR #50949 on 2026-04-11 — awaiting tagged release

https://github.com/electron/electron/pull/50949
github_pr

fix: restrict window.open features to allowlisted BrowserWindow options

Fix merged in electron/electron PR #50948 on 2026-04-12 — awaiting tagged release

https://github.com/electron/electron/pull/50948
github_pr

fix: restrict window.open features to allowlisted BrowserWindow options

Fix merged in electron/electron PR #50947 on 2026-04-12 — awaiting tagged release

https://github.com/electron/electron/pull/50947
github_pr

fix: restrict window.open features to allowlisted BrowserWindow options

Fix merged in electron/electron PR #50946 on 2026-04-11 — awaiting tagged release

https://github.com/electron/electron/pull/50946
github Patch Available

window.open features string controls some window options considered privileged · Advisory · electron/electron · GitHub

https://github.com/electron/electron/security/advisories/GHSA-v93f-fgjr-hjrj

Vendor Advisories for CVE-2026-70607(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
electron—42.0.0-beta.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-19 21:52 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 21:43 UTCEG score recompute
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-17 21:13 UTCEG score recompute
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-16 21:05 UTCEG score recompute
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 02:15 UTCEPSS rescore
  13. 2026-08-15 20:57 UTCEG score recompute
  14. 2026-08-15 01:31 UTCEPSS rescore
  15. 2026-08-14 20:48 UTCEG score recompute
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-12 20:30 UTCEG score recompute
  18. 2026-08-12 13:51 UTCEPSS rescore
  19. 2026-08-11 20:22 UTCEG score recompute
  20. 2026-08-11 00:00 UTCEPSS rescore
  21. 2026-08-09 20:05 UTCEG score recompute
  22. 2026-08-09 13:47 UTCEPSS rescore
  23. 2026-08-08 19:57 UTCEG score recompute
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-07 19:48 UTCEG score recompute
Show 7 more
  1. 2026-08-06 19:40 UTCEG score recompute
  2. 2026-08-06 13:47 UTCEPSS rescore
  3. 2026-08-05 19:31 UTCEG score recompute
  4. 2026-08-05 19:01 UTCEG score recompute
  5. 2026-08-05 17:30 UTCEG score recompute
  6. 2026-08-05 16:51 UTCEG score recompute
  7. 2026-08-05 16:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70607?
CVE-2026-70607 is a medium vulnerability published on August 5, 2026. Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, some window options supplied by web content in the window.open() features string were applied to the new BrowserWindow without an allowlist.…
When was CVE-2026-70607 disclosed?
CVE-2026-70607 was first published in the National Vulnerability Database on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70607 actively exploited?
CVE-2026-70607 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.4% of all scored CVEs.
What is the CVSS score of CVE-2026-70607?
CVE-2026-70607 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-70607?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70607, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-70607

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