GHSA-r5p7-gp4j-qhrx CVE-2026-34777

Electron: Incorrect origin passed to permission request handler for iframe requests

Medium npm

Severity: 5.4 / 10; Medium · CVSS 3.1
Exploit chance (EPSS): 0.12%; Chance of exploitation in the next 30 days. Higher than 2.10% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-346 Origin Validation Error
Fix: 38.8.6; Upgrade electron to this version or later

Description

Impact

When an iframe requests fullscreen, pointerLock, keyboardLock, openExternal, or media permissions, the origin passed to session.setPermissionRequestHandler() was the top-level page's origin rather than the requesting iframe's origin. Apps that grant permissions based on the origin parameter or webContents.getURL() may inadvertently grant permissions to embedded third-party content.

The correct requesting URL remains available via details.requestingUrl. Apps that already check details.requestingUrl are not affected.

Workarounds

In your setPermissionRequestHandler, inspect details.requestingUrl rather than the origin parameter or webContents.getURL() when deciding whether to grant fullscreen, pointerLock, keyboardLock, openExternal, or media permissions.

Fixed Versions

41.0.0
40.8.1
39.8.1
38.8.6

For more information

If there are any questions or comments about this advisory, please email security@electronjs.org

Affected versions

npm

Package	Vulnerable	Fixed in
electron	`< 38.8.6`	`38.8.6`
electron	`>= 39.0.0-alpha.1, < 39.8.1`	`39.8.1`
electron	`>= 40.0.0-alpha.1, < 40.8.1`	`40.8.1`
electron	`>= 41.0.0-alpha.1, < 41.0.0`	`41.0.0`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

electron npm → `38.8.6`

npm

npm install electron@38.8.6

yarn

yarn add electron@38.8.6

pnpm

pnpm add electron@38.8.6

Severity breakdown

CVSS 3.1 5.4

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Weakness

CWE-346: Origin Validation Error

The product does not properly verify that the source of data or communication is valid.

References

Advisories

nvd.nist.gov/vuln/detail/CVE-2026-34777

Packages

github.com/electron/electron

Timeline

Apr 3, 2026 Published
Jul 24, 2026 Last updated by the source
Nov 1, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-qqvq-6xgj-jw8g Electron affected by libvpx's heap buffer overflow in vp8 encoding	High Known exploited	Also affects electron
GHSA-j7hp-h8jx-5ppr libwebp: OOB write in BuildHuffmanTable	High Known exploited	Also affects electron
GHSA-995f-9x5r-2rcj Heap buffer overflow in GPU	Critical Known exploited	Also affects electron
GHSA-jr5w-w6x2-84p9 Electron: Mitigation for compromised eMudhra intermediate certificates	High	Also affects electron
GHSA-h3v5-h239-pg29 Electron: Off-screen rendering on macOS trusts GPU-supplied frame geometry	Low	Also affects electron
GHSA-3qxv-5xgr-q7w9 Electron: Frame subscription trusts GPU-supplied frame geometry	Low	Also affects electron
GHSA-997q-gvvc-jwmx Electron: openExternal permission requests can be attributed to the wrong origin	Medium	Also affects electron
GHSA-fw47-9c62-h3vw Electron: HID and USB permission checks can be attributed to the wrong origin	Medium	Also affects electron

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