{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "38.8.6"
              },
              {
                "introduced": "39.0.0"
              },
              {
                "fixed": "39.8.1"
              },
              {
                "introduced": "40.0.0"
              },
              {
                "fixed": "40.8.1"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fbc489c43be82f0fc331560ae678a39aeaea38c8"
            },
            {
              "introduced": "0abda746eabbca48066f7425c5db5dba53bb37f5"
            },
            {
              "fixed": "bd3abf3a2c91fcf09525ea105a9e38e50c19d00a"
            },
            {
              "introduced": "35b8855913a75fbb6ee8b1465388c033535da634"
            },
            {
              "fixed": "9be5389e77dfb25d4ce835678c2969dbbc6418a0"
            }
          ],
          "repo": "https://github.com/electron/electron",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xj5x-m3f3-5x3h"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-290",
      "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34778.json"
  },
  "details": "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, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.",
  "id": "CVE-2026-34778",
  "modified": "2026-07-08T05:37:09.504949292Z",
  "published": "2026-04-03T23:59:07.419Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34778.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/electron/electron/security/advisories/GHSA-xj5x-m3f3-5x3h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34778"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Electron: Service worker can spoof executeJavaScript IPC replies"
}