What is CVE-2026-34777?

CVE-2026-34777 is a medium-severity vulnerability in Electron, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2026-04-03.

How severe is CVE-2026-34777?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Electron

CVE-2026-34777

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, when an iframe requests fullscreen, pointerLock, keyboardLock, openExternal, or m…

EPSS: 0.000 (0.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Electron — versions < 38.8.6, >= 39.0.0-alpha.1, < 39.8.1, >= 40.0.0-alpha.1, < 40.8.1

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

https://github.com/electron/electron/security/advisories/GHSA-r5p7-gp4j-qhrx (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-34777?: CVE-2026-34777 is a medium-severity vulnerability in Electron, classified under Origin Validation Error. CVSS score: 5.4/10. Published 2026-04-03.
How severe is CVE-2026-34777?: Medium severity. CVSS v3 base score is 5.4 out of 10.