MediumCVE-2026-70609

    Electron: DevTools JavaScript Injection via Unsanitized Dock State Parameter (CVE-2026-70609)

    Published Last modified Sources: CVE.org, OSV

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    What is affected, what to do

    Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, the mode option of webContents.openDevTools() was not sanitized before use by the DevTools frontend.

    Update Electron to version 39.8.7.

    Affected
    • Electron gte 40.0.0-alpha.1, < 40.9.0..*
    • Electron lt *..39.8.7
    Fixed in
    • Electron 39.8.7

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

    Metrics

    5.7

    Priority

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

    Source: NVD, CVSS v3

    5.7

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: CVE.org, OSV

    0.5 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 45.0

    Show all metrics
    Severity
    Medium
    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
    66.70 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
    5.7 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
    5.7
    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
    0.5 %
    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
    45.0
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    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
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 5 August 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-94, CWE-116

    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
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    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 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, the mode option of webContents.openDevTools() was not sanitized before use by the DevTools frontend. If an attacker can influence this value, script under their control may run in the DevTools context, which in unsandboxed configurations has access to Node.js, including when untrusted input reaches the mode argument of openDevTools() or untrusted content calls openDevTools() on a webview it embeds. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.

    Source: NVD (NIST), OSV (Open Source Vulnerabilities), cvelistv5

    Affected products

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

    Affected products
    Affected versionsFixed in
    electronelectron
    • < 39.8.7
    • ≥ 40.0.0-alpha.1, < 40.9.0
    • 39.8.7
    • —
    electronjselectron
    • 42.0.0
    • 41.0.0 – < 41.2.0
    • 40.0.0 – < 40.9.0
    • < 39.8.7
    • —
    • 41.2.0
    • 40.9.0
    • 39.8.7

    Vendors and products

    Weakness classes (CWE)

    • CWE-94Improper Control of Generation of Code ('Code Injection')

      Base

      The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

      Entry at MITRE CWE-94

    • CWE-116Improper Encoding or Escaping of Output

      Class

      The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

      Entry at MITRE CWE-116

    References & sources

    • github.comelectron/electron/security/advisories/GHSA-4f78-qhmw-8j8mweb, x_refsource_CONFIRM
    • github.comelectron/electron/pull/50665web, x_refsource_MISC
    • github.comelectron/electron/pull/50666web, x_refsource_MISC
    • github.comelectron/electron/pull/50667web, x_refsource_MISC
    • github.comelectron/electron/pull/50668web, x_refsource_MISC
    • github.comelectron/electron/commit/04614eed17986bddc43eb509ec870424ee6a47…web, x_refsource_MISC
    • github.comelectron/electron/commit/2046ae87731d80a7b535512ae19acb529e10e3…web, x_refsource_MISC
    • github.comelectron/electron/commit/969741f9f847c5c583f6bbc63ca22549dbd954…web, x_refsource_MISC
    • github.comelectron/electron/commit/efc4d3c6b6f1c04f658ca0d9d2512dcfe78eb7…web, x_refsource_MISC
    • github.comelectron/electronpackage
    • github.comelectron/electron/releases/tag/v39.8.7web, x_refsource_MISC
    • github.comelectron/electron/releases/tag/v40.9.0web, x_refsource_MISC
    • github.comelectron/electron/releases/tag/v41.2.0web, x_refsource_MISC
    • github.comelectron/electron/releases/tag/v42.0.0-beta.1web, x_refsource_MISC

    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).

    1. Initial analysis by NVDNVD

      Newly listed as affected:
      Show 14 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Product configurationadded
      —
      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 from (including) 40.0.0 up to (excluding) 40.9.0 *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:*:*:*:*:*:node.js:*:* versions up to (excluding) 39.8.7 *cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* versions from (including) 41.0.0 up to (excluding) 41.2.0
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/commit/04614eed17986bddc43eb509ec870424ee6a47d1 Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/commit/2046ae87731d80a7b535512ae19acb529e10e33b Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/commit/969741f9f847c5c583f6bbc63ca22549dbd954ce Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/commit/efc4d3c6b6f1c04f658ca0d9d2512dcfe78eb7ba Types: Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/pull/50665 Types: Issue Tracking, Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/pull/50666 Types: Issue Tracking, Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/pull/50667 Types: Issue Tracking, Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/pull/50668 Types: Issue Tracking, Patch
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/releases/tag/v39.8.7 Types: Release Notes
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/releases/tag/v40.9.0 Types: Release Notes
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/releases/tag/v41.2.0 Types: Release Notes
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/releases/tag/v42.0.0-beta.1 Types: Release Notes
      Reference typeadded
      —
      GitHub, Inc.: https://github.com/electron/electron/security/advisories/GHSA-4f78-qhmw-8j8m Types: Vendor Advisory

      Source identifier: nvd@nist.gov

    2. Record modifiedCISA ADP

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

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentchanged
      {"id":"CVE-2026-70609","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-05T19:34:53.906480Z"}
      {"id":"CVE-2026-70609","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-05T00:00:00+00:00"}

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

    3. Record modifiedCISA ADP

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

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-70609","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-05T19:34:53.906480Z"}

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

    4. ReceivedGitHub

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

      Weakness type: CWE-94, CWE-116

      Description added or changed

      Show 18 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      electron
      Descriptionadded
      —
      Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, the mode option of webContents.openDevTools() was not sanitized before use by the DevTools frontend. If an attacker can influence this value, script under their control may run in the DevTools context, which in unsandboxed configurations has access to Node.js, including when untrusted input reaches the mode argument of openDevTools() or untrusted content calls openDevTools() on a webview it embeds. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.
      CVSSadded
      —
      AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
      Weakness type (CWE)added
      —
      CWE-94
      Weakness type (CWE)added
      —
      CWE-116
      Referenceadded
      —
      https://github.com/electron/electron/commit/04614eed17986bddc43eb509ec870424ee6a47d1
      Referenceadded
      —
      https://github.com/electron/electron/commit/2046ae87731d80a7b535512ae19acb529e10e33b
      Referenceadded
      —
      https://github.com/electron/electron/commit/969741f9f847c5c583f6bbc63ca22549dbd954ce
      Referenceadded
      —
      https://github.com/electron/electron/commit/efc4d3c6b6f1c04f658ca0d9d2512dcfe78eb7ba
      Referenceadded
      —
      https://github.com/electron/electron/pull/50665
      Referenceadded
      —
      https://github.com/electron/electron/pull/50666
      Referenceadded
      —
      https://github.com/electron/electron/pull/50667
      Referenceadded
      —
      https://github.com/electron/electron/pull/50668
      Referenceadded
      —
      https://github.com/electron/electron/releases/tag/v39.8.7
      Referenceadded
      —
      https://github.com/electron/electron/releases/tag/v40.9.0
      Referenceadded
      —
      https://github.com/electron/electron/releases/tag/v41.2.0
      Referenceadded
      —
      https://github.com/electron/electron/releases/tag/v42.0.0-beta.1
      Referenceadded
      —
      https://github.com/electron/electron/security/advisories/GHSA-4f78-qhmw-8j8m

      Source identifier: security-advisories@github.com

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