CVE-2026-34780 | Electron: Context Isolation bypass via contextBridge VideoFrame transfer

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From versions 39.0.0-alpha.1 to before 39.8.0, 40.0.0-alpha.1 to before 40.7.0, and 41.0.0-alpha.1 to before 41.0.0-beta.8, apps that pass VideoFrame objects (from the WebCodecs API) across the contextBridge are vulnerable to a context isolation bypass. An attacker who can execute JavaScript in the main world (for example, via XSS) can use a bridged VideoFrame to gain access to the isolated world, including any Node.js APIs exposed to the preload script. Apps are only affected if a preload script returns, resolves, or passes a VideoFrame object to the main world via contextBridge.exposeInMainWorld(). Apps that do not bridge VideoFrame objects are not affected. This issue has been patched in versions 39.8.0, 40.7.0, and 41.0.0-beta.8.

Published: 2026-04-04 Last update: 2026-04-14 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-34780 is rated Low Risk (37.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-34780

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-04 — 0.04% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-34780

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.3 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 6.0 [email protected]
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]

Weakness enumeration for CVE-2026-34780

GitHub Security Advisory for CVE-2026-34780

GHSA-jfqg-hf23-qpw2 · Severity: high · Ecosystem: npm — Electron: Context Isolation bypass via contextBridge VideoFrame transfer

OS Trackers for CVE-2026-34780

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2026-34780

Affected software / configurations for CVE-2026-34780

Vendor Product Version Raw CPE
electronjs electron >= 39.0.0, < 39.8.0 cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*
electronjs electron >= 40.0.0, < 40.7.0 cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:*
electronjs electron 41.0.0 cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:*

References for CVE-2026-34780

cvelogic Threat Intelligence