Angry bug hunter with Microsoft beef drops new Windows 0-day
Assuming the attacker can win a race condition, this bug allows local privilege escalation and leads to SYSTEM-level control over an affected machine. Nightmare Eclipse (aka Chaotic Eclipse) is a disgruntled bug hunter with a deep understanding of Windows and an even deeper grudge against Microsoft. They claim to be an ex-employee, and accuse Redmond of ignoring vulnerability reports and refusing to communicate with them.
- ▪Assuming the attacker can win a race condition, this bug allows local privilege escalation and leads to SYSTEM-level control over an affected machine.
- ▪Nightmare Eclipse (aka Chaotic Eclipse) is a disgruntled bug hunter with a deep understanding of Windows and an even deeper grudge against Microsoft.
- ▪They claim to be an ex-employee, and accuse Redmond of ignoring vulnerability reports and refusing to communicate with them.
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Record
| Original publisher | theregister |
| Canonical URL | https://www.theregister.com/security/2026/06/10/nightmare-eclipse-publishes-new-windows-defender-zero-day/5253725 |
| Publication time | Wed, 10 Jun 2026 20:45:05 +0200 |
| Retrieval time | 2026-06-10T20:03:29.885Z |
| Last seen | 2026-06-10T20:03:29.885Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | qqHzKwPSuYix |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); Security Angry bug hunter with Microsoft beef drops new Windows 0-day Revenge is a dish best served code Jessica Lyons Jessica Lyons Published wed 10 Jun 2026 // 19:45 UTC They are angry at Redmond and will have their revenge.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at theregister.
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