{
  "id": 785335,
  "title": "Microsoft's nemesis returns: Nightmare Eclipse is back with a new zero day which could be bad news for Windows users",
  "url": "https://urgent.news/2026/08/13/microsofts-nemesis-returns-nightmare-eclipse-is-back-with-a-new-zero",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-08-13T16:35:00.000Z",
  "source": {
    "name": "TechRadar",
    "slug": "techradar",
    "url": "https://www.techradar.com/pro/security/microsofts-nemesis-returns-nightmare-eclipse-is-back-with-a-new-zero-day-which-could-be-bad-news-for-windows-users"
  },
  "original_language": "en",
  "account": "Microsoft faces a renewed threat as the notorious zero-day researcher, Nightmare Eclipse, has returned with a new exploit called ShieldBreak. This flaw, which bypasses a recent patch, poses a significant risk to Windows users, particularly those using the latest versions of Windows 11. Nightmare Eclipse has a history of targeting Microsoft, starting with BlueHammer in April 2026, and releasing a string of vulnerabilities and exploits, including RedSun, UnDefend, YellowKey, GreenPlasma, MiniPlasma, RoguePlanet, GreatXML, and LegacyHive. Despite Microsoft's response to the reported vulnerability, they have not yet patched ShieldBreak, leaving Windows systems vulnerable. Security researcher Kevin Beaumont confirmed that ShieldBreak is functional on the latest Windows 11, making it a significant concern for users and highlighting the ongoing issue of unpatched vulnerabilities.",
  "summary": "This is the tenth zero-day the disgruntled researcher disclosed, and yet another released soon after a Patch Tuesday.",
  "key_points": [
    "Nightmare Eclipse returns with new zero-day exploit ShieldBreak.",
    "Exploit bypasses recent Windows 11 patch, threatens Windows users.",
    "Microsoft has not patched ShieldBreak, leaving systems vulnerable."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 2,
    "also_reported_by": [
      {
        "outlet": "Android Authority",
        "title": "Galaxy phones are finally letting users remove this longtime Microsoft app",
        "url": "https://urgent.news/2026/08/14/galaxy-phones-are-finally-letting-users-remove-this-longtime",
        "published": "2026-08-14T11:59:45.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}