CVE-2026-70612

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (36th 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.4Exploit: 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, 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 sandbox state was also not made available to the app permission handlers, affecting apps that render untrusted content in sandboxed iframes and grant the openExternal permission by default when no setPermissionRequestHandler is installed. This issue is fixed in 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA 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
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
0.4%
EPSS %ILE
36th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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_pr, github_release.
github_release Patch Available

electron v40.9.0

Patch available: electron/electron v40.9.0

https://github.com/electron/electron/releases/tag/v40.9.0
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_pr

fix: respect iframe sandbox flags for external protocol navigation

Fix merged in electron/electron PR #50964 on 2026-04-12 — awaiting tagged release

https://github.com/electron/electron/pull/50964
github_pr

fix: respect iframe sandbox flags for external protocol navigation

Fix merged in electron/electron PR #50963 on 2026-04-12 — awaiting tagged release

https://github.com/electron/electron/pull/50963
github_pr

fix: respect iframe sandbox flags for external protocol navigation

Fix merged in electron/electron PR #50962 on 2026-04-12 — awaiting tagged release

https://github.com/electron/electron/pull/50962
github_pr

fix: respect iframe sandbox flags for external protocol navigation

Fix merged in electron/electron PR #50961 on 2026-04-12 — awaiting tagged release

https://github.com/electron/electron/pull/50961
github_commit

commit c39e3d5687d5 (electron/electron)

Fix landed in electron/electron commit c39e3d5687d5 — awaiting tagged release

https://github.com/electron/electron/commit/c39e3d5687d57434c8d5fe814c5152efd2f631c3
github_commit

commit 477dcf7afc65 (electron/electron)

Fix landed in electron/electron commit 477dcf7afc65 — awaiting tagged release

https://github.com/electron/electron/commit/477dcf7afc6550715f9ec5e6f39ee38e5dd7bf39
github_commit

commit 2764e4c35168 (electron/electron)

Fix landed in electron/electron commit 2764e4c35168 — awaiting tagged release

https://github.com/electron/electron/commit/2764e4c35168855f614876051823db4f58a3714a
github_commit

commit 08b9d0a220e2 (electron/electron)

Fix landed in electron/electron commit 08b9d0a220e2 — awaiting tagged release

https://github.com/electron/electron/commit/08b9d0a220e267d1a2402a44bdd01a2e9aa320b5

Vendor Advisories for CVE-2026-70612(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 / 43× 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 05:58 UTCEG score recompute
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-02 17:56 UTCEPSS rescore
  5. 2026-10-02 09:52 UTCEG score recompute
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 02:15 UTCEG score recompute
  8. 2026-09-30 15:03 UTCEPSS rescore
  9. 2026-09-29 06:13 UTCEG score recompute
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 17:39 UTCEG score recompute
  12. 2026-09-27 13:48 UTCEPSS rescore
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-25 04:30 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 14:11 UTCEG score recompute
  17. 2026-09-22 13:03 UTCEG score recompute
  18. 2026-09-21 21:09 UTCEPSS rescore
  19. 2026-09-21 13:13 UTCEG score recompute
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 03:20 UTCEG score recompute
  22. 2026-09-19 03:30 UTCEG score recompute
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-18 03:40 UTCEG score recompute
  25. 2026-09-17 03:51 UTCEG score recompute
Show 71 more
  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-16 03:10 UTCEG score recompute
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 01:37 UTCEG score recompute
  6. 2026-09-13 01:48 UTCEG score recompute
  7. 2026-09-12 15:02 UTCEPSS rescore
  8. 2026-09-12 01:58 UTCEG score recompute
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 02:08 UTCEG score recompute
  11. 2026-09-10 09:35 UTCEPSS rescore
  12. 2026-09-10 02:18 UTCEG score recompute
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-07 18:12 UTCEG score recompute
  15. 2026-09-07 16:01 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-06 09:24 UTCEG score recompute
  18. 2026-09-05 15:31 UTCEPSS rescore
  19. 2026-09-05 09:18 UTCEG score recompute
  20. 2026-09-04 09:28 UTCEG score recompute
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-03 06:44 UTCEG score recompute
  23. 2026-09-02 14:12 UTCEPSS rescore
  24. 2026-09-01 22:36 UTCEG score recompute
  25. 2026-09-01 13:54 UTCEPSS rescore
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-08-30 21:10 UTCEG score recompute
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 21:20 UTCEG score recompute
  31. 2026-08-28 21:42 UTCEPSS rescore
  32. 2026-08-27 19:54 UTCEG score recompute
  33. 2026-08-26 19:06 UTCEG score recompute
  34. 2026-08-26 14:47 UTCEPSS rescore
  35. 2026-08-25 18:21 UTCEG score recompute
  36. 2026-08-25 13:49 UTCEPSS rescore
  37. 2026-08-24 18:32 UTCEG score recompute
  38. 2026-08-23 18:42 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-22 18:53 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescore
  42. 2026-08-21 19:03 UTCEG score recompute
  43. 2026-08-20 22:56 UTCEPSS rescore
  44. 2026-08-19 19:24 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-18 19:20 UTCEG score recompute
  47. 2026-08-18 13:49 UTCEPSS rescore
  48. 2026-08-18 13:49 UTCEPSS rescore
  49. 2026-08-17 19:30 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-16 18:35 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 18:46 UTCEG score recompute
  56. 2026-08-15 01:31 UTCEPSS rescore
  57. 2026-08-14 18:56 UTCEG score recompute
  58. 2026-08-13 22:00 UTCEPSS rescore
  59. 2026-08-12 19:16 UTCEG score recompute
  60. 2026-08-12 13:51 UTCEPSS rescore
  61. 2026-08-11 19:27 UTCEG score recompute
  62. 2026-08-11 00:00 UTCEPSS rescore
  63. 2026-08-09 19:49 UTCEG score recompute
  64. 2026-08-09 13:47 UTCEPSS rescore
  65. 2026-08-08 20:00 UTCEG score recompute
  66. 2026-08-08 16:37 UTCEPSS rescore
  67. 2026-08-07 20:11 UTCEG score recompute
  68. 2026-08-06 20:22 UTCEG score recompute
  69. 2026-08-06 13:47 UTCEPSS rescore
  70. 2026-08-05 19:30 UTCEG score recompute
  71. 2026-08-05 18:07 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-70612?
CVE-2026-70612 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, requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could…
When was CVE-2026-70612 disclosed?
CVE-2026-70612 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-2026-70612 actively exploited?
CVE-2026-70612 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70612?
CVE-2026-70612 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70612?
A fix for CVE-2026-70612 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70612 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-70612

Explore →

Is Your Infrastructure Affected by CVE-2026-70612?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs