EUVD-2026-89078Published

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-102673

Published

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 41.10.4, 42.5.2, and 43.0.0, popups opened from a sandboxed iframe through Electron's OpenURLFromTab navigation path, including links using target="_blank" or a middle-click, did not receive the inherited HTML sandbox restrictions. An untrusted iframe using the allow-scripts allow-popups configuration could therefore open a popup with the embedding application's full origin, exposing that origin's cookies, storage, and same-origin scripting capabilities. Applications that do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in versions 41.10.4, 42.5.2, and 43.0.0.

Source published: 29 Sep 2026 16:38:41 UTC
Source modified: 30 Sep 2026 20:11:08 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

euvd · EUVD-2026-89078

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 29, 2026, 4:38:41 PM

dateUpdated: Sep 30, 2026, 8:11:08 PM

Source published: Sep 29, 2026, 4:38:41 PM (timezone not stated)
Source modified: Sep 30, 2026, 8:11:08 PM (timezone not stated)
Observed here: 9 Nov 2026 05:03:34 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

nvd · CVE-2026-102673

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-346 · CWE-693

Original publisher date fields

published: 2026-09-29T17:17:07.487

lastModified: 2026-10-15T14:01:06.497

9 source CPE criteria · context only

cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha3:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha4:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha5:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:alpha6:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:beta1:*:*:*:node.js:*:*
cpe:2.3:a:electronjs:electron:42.0.0:beta2:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 29 Sep 2026 17:17:07 UTC
Source modified: 15 Oct 2026 14:01:06 UTC
Observed here: 25 Oct 2026 04:17:26 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

CVSS 3.1 · [email protected] · Primary · 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

osv · GHSA-hq2x-r82h-9wj4

Published

### Impact Popups opened from a sandboxed iframe through a link (for example `target="_blank"` or a middle-click) did not inherit the iframe's HTML `sandbox` restrictions. Content that was meant to run sandboxed could open a popup with the embedding app's full origin, gaining access to that origin's cookies, storage, and same-origin scripting. Apps are only affected if they embed untrusted content in iframes sandboxed with `allow-scripts allow-popups`. Apps that do not embed untrusted content in sandboxed iframes are not affected. ### Workarounds Use `setWindowOpenHandler` on the parent `WebContents` to deny or constrain popups opened from sandboxed frames, or do not apply `allow-popups` to sandboxed iframes that render untrusted content. ### Fixed Versions * `43.0.0` * `42.5.2` * `41.10.4` ### For more information If you have any questions or comments about this advisory, email us at [[email protected]](mailto:[email protected])

Source published: 29 Sep 2026 18:05:34 UTC
Source modified: 29 Sep 2026 18:15:04 UTC
Observed here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Publisher rating · HIGH