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%, top 71% 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: 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, 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
5.4(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
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_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 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 / 29× 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 19:24 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 19:20 UTCEG score recompute
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-17 19:30 UTCEG score recompute
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-16 18:35 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 18:46 UTCEG score recompute
  14. 2026-08-15 01:31 UTCEPSS rescore
  15. 2026-08-14 18:56 UTCEG score recompute
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-12 19:16 UTCEG score recompute
  18. 2026-08-12 13:51 UTCEPSS rescore
  19. 2026-08-11 19:27 UTCEG score recompute
  20. 2026-08-11 00:00 UTCEPSS rescore
  21. 2026-08-09 19:49 UTCEG score recompute
  22. 2026-08-09 13:47 UTCEPSS rescore
  23. 2026-08-08 20:00 UTCEG score recompute
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-07 20:11 UTCEG score recompute
Show 4 more
  1. 2026-08-06 20:22 UTCEG score recompute
  2. 2026-08-06 13:47 UTCEPSS rescore
  3. 2026-08-05 19:30 UTCEG score recompute
  4. 2026-08-05 18:07 UTCEG score recompute

Related CVEs(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 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-2026-70612 actively exploited?
CVE-2026-70612 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 70.6% of all scored CVEs.
What is the CVSS score of CVE-2026-70612?
CVE-2026-70612 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-70612?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70612, 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-2026-70612

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