CVE-2026-70599

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 92% 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
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: 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 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, serial-port and media permission checks made from an iframe passed the top-level frame origin to session.setPermissionCheckHandler instead of the requesting iframe origin. Origin-based handler logic could grant a cross-origin iframe device access intended only for the top-level origin. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

August 5, 2026

Last Modified

September 8, 2026

Advisory Details (2)

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

Permission Check Handler Receives Main Frame Origin Instead of Requesting Iframe Origin · Advisory · electron/electron · GitHub

https://github.com/electron/electron/security/advisories/GHSA-9pf5-hg6p-4pwp
github_commit

commit 0cbdf2f03754 (electron/electron)

Fix landed in electron/electron commit 0cbdf2f03754 — awaiting tagged release

https://github.com/electron/electron/commit/0cbdf2f0375466d701aa393c92e0ec29eb89ea6c

Vendor Advisories for CVE-2026-70599(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.1—

Weakness Classification(1)

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

Data Freshness Timeline

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70599?
CVE-2026-70599 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 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, serial-port and media permission checks made from an iframe passed the top-level frame origin to session.setPermissionCheckHandler instead of…
When was CVE-2026-70599 disclosed?
CVE-2026-70599 was first published in the National Vulnerability Database 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-2026-70599 actively exploited?
CVE-2026-70599 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 92.0% of all scored CVEs.
What is the CVSS score of CVE-2026-70599?
CVE-2026-70599 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-70599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70599, 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-2026-70599

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