How severe is CVE-2026-34777?

CVE-2026-34777 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-34777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34777?

CVE-2026-34777 primarily affects Electronjs Electron. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-34777?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34777 have an EU (EUVD) identifier?

Yes. CVE-2026-34777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18953.

When was CVE-2026-34777 published?

CVE-2026-34777 was published on 2026-04-04 and last updated on 2026-06-17.

CVE-2026-34777

CVE-2026-34777 is a medium-severity vulnerability in Electronjs Electron with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18953
Weakness: CWE-346
Affected product: Electronjs Electron
Published: 2026-04-04
Last modified: 2026-06-17

Description

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 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. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

Frequently asked questions

What is 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 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. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
How severe is CVE-2026-34777?: CVE-2026-34777 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-34777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34777?: CVE-2026-34777 primarily affects Electronjs Electron. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-34777?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34777 have an EU (EUVD) identifier?: Yes. CVE-2026-34777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18953.
When was CVE-2026-34777 published?: CVE-2026-34777 was published on 2026-04-04 and last updated on 2026-06-17.

References

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

Affected products (15)

cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:41.0.0:beta8:*:*:*:node.js:*:*

More vulnerabilities in Electronjs Electron

CVE-2017-16151 — Critical (CVSS 9.8): Based on details posted by the ElectronJS team; A remote code execution vulnerability has been discovered in Google…
CVE-2018-1000118 — High (CVSS 8.8): Github Electron version Electron 1.8.2-beta.4 and earlier contains a Command Injection vulnerability in Protocol…
CVE-2026-34780 — High (CVSS 8.3): Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From versions…
CVE-2026-34774 — High (CVSS 8.1): Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to…
CVE-2018-15685 — High (CVSS 8.1): GitHub Electron 1.7.15, 1.8.7, 2.0.7, and 3.0.0-beta.6, in certain scenarios involving IFRAME elements and…
CVE-2018-1000136 — High (CVSS 8.1): Electron version 1.7 up to 1.7.12; 1.8 up to 1.8.3 and 2.0.0 up to 2.0.0-beta.3 contains an improper handling of values…

All CVEs affecting Electronjs Electron →

Other CWE-346 vulnerabilities

CVE-2026-42901 — Critical (CVSS 10.0): Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-6508 — Critical (CVSS 9.8): Origin Validation Error vulnerability in TUBITAK BILGEM Software Technologies Research Institute Liderahenk allows…
CVE-2026-2790 — Critical (CVSS 9.8): Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR…
CVE-2022-50925 — Critical (CVSS 9.8): Prowise Reflect version 1.0.9 contains a remote keystroke injection vulnerability that allows attackers to send…
CVE-2025-30466 — Critical (CVSS 9.8): This issue was addressed through improved state management. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS…
CVE-2024-8487 — Critical (CVSS 9.8): A Cross-Origin Resource Sharing (CORS) vulnerability exists in modelscope/agentscope version v0.0.4. The CORS…

Browse all CWE-346 vulnerabilities →