HighCVE-2026-102673

Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab (CVE-2026-102673)

Published 29.09.2026Last modified 15.10.2026Sources: CVE.org, OSV, Hersteller

What is affected, what to do

Update Electron to version 41.10.4.

Affected: Electron gte 42.0.0-alpha.1, < 42.5.2..*
Electron lt *..41.10.4
Fixed in: Electron 41.10.4

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

8.2

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

8.2

CVSS v3

Severity High on the scale from 0 to 10.

Source: CVE.org, OSV, Hersteller

0.1 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 2.8

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 70.05 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 8.2 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 8.2
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.1 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 2.8; Low — this CVE sits in the lower 10% of all CVEs scored today.
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 29.09.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: partial; Source: CISA Vulnrichment, as of 30 September 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-346, CWE-693

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

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: NVD (NIST), OSV (Open Source Vulnerabilities), GitHub Security Advisories, cvelistv5

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
electron	electron	`≥ 42.0.0-alpha.1, < 42.5.2` `< 41.10.4`	— `41.10.4`
electronjs	electron	`42.0.0` `41.0.0 – ≤ 41.2.1` `40.0.0 – < 40.9.0` `< 39.8.8`	— — `40.9.0` `39.8.8`

Vendors and products

Weakness classes (CWE)

CWE-346Origin Validation Error
Class
The product does not properly verify that the source of data or communication is valid.
Entry at MITRE CWE-346
CWE-693Protection Mechanism Failure
Pillar
The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
Entry at MITRE CWE-693

References & sources

github.comelectron/electron/security/advisories/GHSA-hq2x-r82h-9wj4x_refsource_CONFIRM
github.comelectron/electron/pull/52133x_refsource_MISC
github.comelectron/electron/commit/7ea14d5f55ecb11a30447701ddca16b3feee0b…x_refsource_MISC
github.comelectron/electron/commit/e26b2640e7795c42bfb111b76009cbb4327c9a…x_refsource_MISC
github.comelectron/electron/commit/ebe1165ee2b05c203c26dd2244ef1c5b9b1c04…x_refsource_MISC
github.comelectron/electron/releases/tag/v41.10.4x_refsource_MISC
github.comelectron/electron/releases/tag/v42.5.2x_refsource_MISC
github.comelectron/electron/releases/tag/v43.0.0x_refsource_MISC
github.comelectron/electronpackage

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

15.10.2026Initial analysis by NVDNVD

Newly listed as affected:

HackerOne electron node module (before 39.8.8; 40.0.0 – before 40.9.0; 41.0.0 – through 41.2.1; 8 individual versions)

CVSS V3.1: AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

New references:

and 4 more references

Show 10 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
CVSS	added	—	AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Product configuration	added	—	OR 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::::::node.js:: versions up to (excluding) 39.8.8 cpe:2.3:a:electronjs:electron::::::node.js:: versions from (including) 40.0.0 up to (excluding) 40.9.0 cpe:2.3:a:electronjs:electron::::::node.js:: versions from (including) 41.0.0 up to (including) 41.2.1 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::
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/commit/7ea14d5f55ecb11a30447701ddca16b3feee0bba Types: Patch
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/commit/e26b2640e7795c42bfb111b76009cbb4327c9a69 Types: Patch
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/commit/ebe1165ee2b05c203c26dd2244ef1c5b9b1c04da Types: Patch
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/pull/52133 Types: Issue Tracking, Patch
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/releases/tag/v41.10.4 Types: Issue Tracking, Patch
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/releases/tag/v42.5.2 Types: Release Notes
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/releases/tag/v43.0.0 Types: Release Notes
Reference type	added	—	GitHub, Inc.: https://github.com/electron/electron/security/advisories/GHSA-hq2x-r82h-9wj4 Types: Vendor Advisory

Source identifier: nvd@nist.gov

30.09.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-102673","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-30T19:34:09.694143Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

29.09.2026ReceivedGitHub

CVSS V3.1: AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Weakness type: CWE-346, CWE-693

Description added or changed

New references:

and 4 more references

Show 13 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	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.
CVSS	added	—	AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness type (CWE)	added	—	CWE-346
Weakness type (CWE)	added	—	CWE-693
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/102xxx/CVE-2026-102673.json">CVE-2026-102673</a>
Reference	added	—	https://github.com/electron/electron/commit/7ea14d5f55ecb11a30447701ddca16b3feee0bba
Reference	added	—	https://github.com/electron/electron/commit/e26b2640e7795c42bfb111b76009cbb4327c9a69
Reference	added	—	https://github.com/electron/electron/commit/ebe1165ee2b05c203c26dd2244ef1c5b9b1c04da
Reference	added	—	https://github.com/electron/electron/pull/52133
Reference	added	—	https://github.com/electron/electron/releases/tag/v41.10.4
Reference	added	—	https://github.com/electron/electron/releases/tag/v42.5.2
Reference	added	—	https://github.com/electron/electron/releases/tag/v43.0.0
Reference	added	—	https://github.com/electron/electron/security/advisories/GHSA-hq2x-r82h-9wj4

Source identifier: security-advisories@github.com

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