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: 0.6% (45th percentile of EPSS-scored CVEs). 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: 0.6%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

September 8, 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 rangeFix by version rangeDependents
electron—
  • every version up to 39.8.8: fixed in 39.8.8
  • 40.0.0-alpha.1 up to 40.9.0: fixed in 40.9.0
  • 41.0.0-alpha.1 up to 41.2.1: fixed in 41.2.1
  • 42.0.0-alpha.1 up to 42.0.0-beta.3: fixed in 42.0.0-beta.3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 42× 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. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 05:59 UTCEG score recompute
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-02 17:56 UTCEPSS rescore
  5. 2026-10-02 09:53 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 02:16 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-29 06:14 UTCEG score recompute
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 17:41 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-25 04:31 UTCEG score recompute
  15. 2026-09-24 01:45 UTCEG score recompute
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 01:37 UTCEG score recompute
  18. 2026-09-22 01:28 UTCEG score recompute
  19. 2026-09-21 21:09 UTCEPSS rescore
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 04:18 UTCEG score recompute
  22. 2026-09-19 04:09 UTCEG score recompute
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-18 04:00 UTCEG score recompute
  25. 2026-09-17 03:51 UTCEG score recompute
Show 74 more
  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-16 03:18 UTCEG score recompute
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 02:58 UTCEG score recompute
  6. 2026-09-13 02:50 UTCEG score recompute
  7. 2026-09-12 15:02 UTCEPSS rescore
  8. 2026-09-12 02:41 UTCEG score recompute
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 02:27 UTCEG score recompute
  11. 2026-09-10 09:35 UTCEPSS rescore
  12. 2026-09-10 02:19 UTCEG score recompute
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-07 18:14 UTCEG score recompute
  15. 2026-09-07 16:01 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-06 09:47 UTCEG score recompute
  18. 2026-09-05 15:31 UTCEPSS rescore
  19. 2026-09-05 09:39 UTCEG score recompute
  20. 2026-09-04 09:30 UTCEG score recompute
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-03 06:46 UTCEG score recompute
  23. 2026-09-02 14:12 UTCEPSS rescore
  24. 2026-09-01 22:56 UTCEG score recompute
  25. 2026-09-01 13:54 UTCEPSS rescore
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-08-30 21:30 UTCEG score recompute
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 21:21 UTCEG score recompute
  31. 2026-08-28 21:42 UTCEPSS rescore
  32. 2026-08-27 23:44 UTCEG score recompute
  33. 2026-08-26 23:28 UTCEG score recompute
  34. 2026-08-26 14:47 UTCEPSS rescore
  35. 2026-08-25 23:19 UTCEG score recompute
  36. 2026-08-25 13:49 UTCEPSS rescore
  37. 2026-08-24 23:01 UTCEG score recompute
  38. 2026-08-23 22:52 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-22 22:27 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescore
  42. 2026-08-21 22:18 UTCEG score recompute
  43. 2026-08-20 22:56 UTCEPSS rescore
  44. 2026-08-19 21:52 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-18 21:43 UTCEG score recompute
  47. 2026-08-18 13:49 UTCEPSS rescore
  48. 2026-08-18 13:49 UTCEPSS rescore
  49. 2026-08-17 21:13 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-16 21:05 UTCEG score recompute
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 14:56 UTCEPSS rescore
  54. 2026-08-16 02:15 UTCEPSS rescore
  55. 2026-08-15 20:57 UTCEG score recompute
  56. 2026-08-15 01:31 UTCEPSS rescore
  57. 2026-08-14 20:48 UTCEG score recompute
  58. 2026-08-13 22:00 UTCEPSS rescore
  59. 2026-08-12 20:30 UTCEG score recompute
  60. 2026-08-12 13:51 UTCEPSS rescore
  61. 2026-08-11 20:22 UTCEG score recompute
  62. 2026-08-11 00:00 UTCEPSS rescore
  63. 2026-08-09 20:05 UTCEG score recompute
  64. 2026-08-09 13:47 UTCEPSS rescore
  65. 2026-08-08 19:57 UTCEG score recompute
  66. 2026-08-08 16:37 UTCEPSS rescore
  67. 2026-08-07 19:48 UTCEG score recompute
  68. 2026-08-06 19:40 UTCEG score recompute
  69. 2026-08-06 13:47 UTCEPSS rescore
  70. 2026-08-05 19:31 UTCEG score recompute
  71. 2026-08-05 19:01 UTCEG score recompute
  72. 2026-08-05 17:30 UTCEG score recompute
  73. 2026-08-05 16:51 UTCEG score recompute
  74. 2026-08-05 16:50 UTCMITRE cvelistV5first tracked

Related CVEs(same product + 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 on August 5, 2026, with the most recent update on September 8, 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 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70607?
CVE-2026-70607 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70607?
A fix for CVE-2026-70607 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70607 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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