# CVE-2026-50661 — Microsoft Windows 10 Version 1607 > As of 2026-07-14, CVE-2026-50661 is a MEDIUM-severity vulnerability in Microsoft Windows 10 Version 1607, CVSS v3.1 6.1. Threadlinqs Intelligence links 14 tracked threat campaigns to CVE-2026-50661, most recently “July 2026 Patch Tuesday: Actively Exploited SharePoint RCE (CVE-2026-58644) and AD FS/SharePoint Zero-Days”. **Last updated:** 2026-07-14 ## What is CVE-2026-50661? Protection mechanism failure in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack. The record classifies CVE-2026-50661 under weakness class [CWE-693](https://cwe.mitre.org/data/definitions/693.html). Its CVSS v3 base vector states that the flaw requires physical access to the device, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 60 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 6.1 — MEDIUM (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C`) - **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog - **Threadlinqs priority:** 3.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability - **Published:** 2026-07-14 ## Is CVE-2026-50661 being exploited? No public exploitation evidence for CVE-2026-50661 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-14. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited. ## Affected products and versions - **Microsoft**: Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022 ## How to fix CVE-2026-50661 No vendor patch reference has been recorded for CVE-2026-50661 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2026-50661 14 tracked threats in the Threadlinqs corpus reference CVE-2026-50661, either in the campaign’s CVE list or as an indicator on the campaign record. - [July 2026 Patch Tuesday: Actively Exploited SharePoint RCE (CVE-2026-58644) and AD FS/SharePoint Zero-Days](https://intel.threadlinqs.com/threat/TL-2026-1437) — CRITICAL · 2026-07-17 - [Actively Exploited SonicWall SMA1000 Zero-Days (CVE-2026-15409, CVE-2026-15410) Chained for Full Appliance Takeover Alongside Microsoft July 2026 Patch Tuesday (570 CVEs, 3 Zero-Days incl. SharePoint & AD FS EoP)](https://intel.threadlinqs.com/threat/TL-2026-1451) — CRITICAL · 2026-07-17 - [CVE-2026-50661: Windows BitLocker Security Feature Bypass 0-Day](https://intel.threadlinqs.com/threat/TL-2026-1346) — MEDIUM · 2026-07-15 - [Microsoft July 2026 Patch Tuesday: Two Actively Exploited Zero-Days in AD FS (CVE-2026-56155) and SharePoint (CVE-2026-56164), Plus Unpatched BitLocker Bypass (CVE-2026-50661)](https://intel.threadlinqs.com/threat/TL-2026-1350) — CRITICAL · 2026-07-15 - [July 2026 Patch Tuesday: Microsoft Fixes 622 CVEs Including Three Actively-Targeted Zero-Days (CVE-2026-56155 AD FS EoP, CVE-2026-56164 SharePoint EoP, CVE-2026-50661 BitLocker Bypass)](https://intel.threadlinqs.com/threat/TL-2026-1372) — CRITICAL · 2026-07-15 - [Microsoft July 2026 Patch Tuesday: 570 Flaws Fixed, 3 Zero-Days Including AD FS and SharePoint Privilege Escalation](https://intel.threadlinqs.com/threat/TL-2026-1324) — CRITICAL · 2026-07-14 - [Microsoft July 2026 Patch Tuesday: 570 Vulnerabilities Fixed, Including 2 Actively Exploited Zero-Days (CVE-2026-56164, CVE-2026-56155)](https://intel.threadlinqs.com/threat/TL-2026-1325) — CRITICAL · 2026-07-14 - [Windows 10 KB5099539 Extended Security Update Patches July 2026 Patch Tuesday Zero-Days — AD FS (CVE-2026-56155), SharePoint (CVE-2026-56164) Exploited; BitLocker (CVE-2026-50661) Publicly Disclosed](https://intel.threadlinqs.com/threat/TL-2026-1326) — HIGH · 2026-07-14 - [Microsoft July 2026 Patch Tuesday: 569 CVEs, Two Actively Exploited Zero-Days (CVE-2026-56155 AD FS EoP, CVE-2026-56164 SharePoint EoP)](https://intel.threadlinqs.com/threat/TL-2026-1327) — CRITICAL · 2026-07-14 - [Microsoft July 2026 Patch Tuesday: 570 Vulnerabilities Including Two Under Active Exploitation (CVE-2026-56155, CVE-2026-56164)](https://intel.threadlinqs.com/threat/TL-2026-1330) — HIGH · 2026-07-14 - [Microsoft July 2026 Patch Tuesday: Record 622 CVEs Include Two Actively Exploited Zero-Days in AD FS (CVE-2026-56155) and SharePoint Server (CVE-2026-56164)](https://intel.threadlinqs.com/threat/TL-2026-1331) — CRITICAL · 2026-07-14 - [Microsoft July 2026 Patch Tuesday: Record 622 Flaws Fixed, Two Zero-Days Under Active Exploitation (CVE-2026-56164, CVE-2026-56155)](https://intel.threadlinqs.com/threat/TL-2026-1334) — CRITICAL · 2026-07-14 - [Microsoft July 2026 Patch Tuesday: Two Actively Exploited Zero-Days in AD FS and SharePoint (CVE-2026-56155, CVE-2026-56164)](https://intel.threadlinqs.com/threat/TL-2026-1336) — CRITICAL · 2026-07-14 - [July 2026 Patch Tuesday: Two Actively Exploited Microsoft Zero-Days (SharePoint EoP CVE-2026-56164, AD FS EoP CVE-2026-56155) Plus SharePoint JWT Auth Bypass CVE-2026-55040](https://intel.threadlinqs.com/threat/TL-2026-1339) — HIGH · 2026-07-14 ## Sources Enriched from CVE.org, NVD, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-14. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50661) Canonical: https://intel.threadlinqs.com/cve/CVE-2026-50661 Full detection coverage and IOCs for threats exploiting CVE-2026-50661 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp