MiniPlasma
A vulnerability in the cldflt!HsmOsBlockPlaceholderAccess routine, previously reported by James Forshaw of Google Project Zero and supposedly patched as CVE-2020-17103, remains unpatched in Windows. The original proof-of-concept exploit still works, allowing for potential privilege escalation to SYSTEM. Researcher MiniPlasma demonstrated the issue by weaponizing the PoC to spawn a SYSTEM shell, indicating a possible failure in Microsoft's patching process.
- ▪The cldflt!HsmOsBlockPlaceholderAccess routine is still vulnerable to the same issue reported by James Forshaw six years ago.
- ▪The original proof-of-concept from Google Project Zero works without modification, indicating the vulnerability was never properly patched.
- ▪MiniPlasma weaponized the exploit to spawn a SYSTEM shell, demonstrating active exploitation potential.
- ▪It is unclear whether Microsoft never applied the fix or silently rolled back the patch for unknown reasons.
- ▪All Windows versions may be affected due to the presence of the unpatched vulnerability.
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | GitHub |
| Canonical URL | https://github.com/Nightmare-Eclipse/MiniPlasma |
| Publication time | Sat, 16 May 2026 14:30:57 +0000 |
| Retrieval time | 2026-05-16T14:40:18.792Z |
| Last seen | 2026-05-16T14:40:18.792Z |
| 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 | None |
| Cluster logic | Not yet clustered, or no peer story found in the clustering window. |
| 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
MiniPlasma After re-investigating the technique used in GreenPlasma (specifically SetPolicyVal), it turns out cldflt!HsmOsBlockPlaceholderAccess is still vulnerable to the exact same issue that was reported to Microsoft 6 years ago. I'm not taking full credit for this, James Forshaw from google project zero found the vulnerability and reported it to Microsoft and was supposedly fixed as CVE-2020-17103. However, a research who's a friend of mine pointed out that the routine might still have a vulnerability, which is something I considered but brushed off because I thought it was impossible for Microsoft to just not patch this or rollback the patch.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.