5.9

CVE-2026-70599: electron Origin Validation Error

CVSS: 5.9v3.1MediumAnalyzed
AliasesGHSA-9pf5-hg6p-4pwp
Published 05-08-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-70599 is a medium (CVSS 5.9) Origin Validation Error vulnerability in electron. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.5% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 05-08-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

+0.01 pp

From 0.18% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Electron1 product
  • electron< 39.8.7 | ≥ 40.0.0-alpha.1, < 40.9.0 | ≥ 41.0.0-alpha.1, < 41.2.0 | ≥ 42.0.0-alpha.1, < 42.0.0-beta.1
Electronjs1 product
  • electron< 39.8.7 | ≥ 40.0.0, < 40.9.0 | ≥ 41.0.0, < 41.2.1 | 42.0.0:alpha1 | 42.0.0:alpha2 | 42.0.0:alpha3 | 42.0.0:alpha4 | 42.0.0:alpha5 | 42.0.0:alpha6 | 42.0.0:beta1 | 42.0.0:beta2
Npm1 product
  • electron< 39.8.7 | ≥ 40.0.0-alpha.1, < 40.9.0 | ≥ 41.0.0-alpha.1, < 41.2.0 | ≥ 42.0.0-alpha.1, < 42.0.0-beta.1

3 vendors · 3 products

References

3 links