CVE-2026-70599: Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS

Q: How do I fix CVE-2026-70599?

electron: upgrade to 39.8.7, 40.9.0, 41.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-70599 being exploited?

CVE-2026-70599 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-70599 affect?

CVE-2026-70599 affects electron. Severity is medium (CVSS 5.9). 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 fra

Q: How urgent is CVE-2026-70599?

Priority 28/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-70599 is a medium-severity flaw (CVSS 5.9) affecting electron. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 is

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-08-05
Last modified	2026-10-08

Publisher (CNA): GitHub, Inc. · Vendor: electronjs

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-05 16:17 UTCPublished CVE record published
2026-10-08 13:54 UTCUpdated Record last modified

electronjs electron UPGRADE

Affected: < 39.8.7 · >= 40.0.0 and < 40.9.0 · >= 41.0.0 and < 41.2.1 · 42.0.0 alpha1 · 42.0.0 alpha2 · 42.0.0 alpha3 · 42.0.0 alpha4 · 42.0.0 alpha5

Fixed in: 39.8.7, 40.9.0, 41.2.1

Safe to downgrade to: a release before 40.0.0

1. Check installed version

npm ls electron

2. UPGRADE to 39.8.7

npm install electron@">=39.8.7"

3. If no update is available yet, DOWNGRADE to a release before 40.0.0

npm view electron versions npm install electron@"<40.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-70599?

electron: upgrade to 39.8.7, 40.9.0, 41.2.1. Exact commands for each OS are on this page.

Is CVE-2026-70599 being exploited?

CVE-2026-70599 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-70599 affect?

CVE-2026-70599 affects electron. Severity is medium (CVSS 5.9). 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 fra

How urgent is CVE-2026-70599?

Priority 28/100. Remotely exploitable, no login, no user action

Software pages

Electron vulnerabilities

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References

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