Windows Sandbox: OS command injection allows local privilege escalation
Summary
Windows Sandbox contains an OS command injection flaw (CWE-78) that allows an authorized local user to escalate privileges. An attacker needs an existing local account with low privileges, and no user interaction is required. Successful exploitation can give the attacker SYSTEM rights on the affected machine (CVSS 7.8, High). The flaw cannot be exploited remotely from the internet.
Affected
- Microsoft Windows Sandbox (optional Windows client feature)
- The CNA record lists the range as "from 1.0.0.0 before 0.8.111.0". This range is internally inconsistent, so the exact affected versions are unknown. Verify on the MSRC page.
Fixed in
- Unknown. Secondary sources state that the fix was included in Microsoft's November 2026 updates (released 10 November 2026). The build numbers could not be confirmed.
- Vendor reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119906
Workaround
- No vendor mitigation found.
- As a general interim measure, disable the optional Windows Sandbox feature if it is not used. This is not confirmed by Microsoft.
Exploitation
- No evidence of exploitation in the wild found. The CISA SSVC assessment lists exploitation as "none", and the Strix record shows KEV: No.
- No public proof of concept found.
- CVSS exploit code maturity is E:U (unproven).
Our recommendation
- Install the November 2026 cumulative updates on all Windows 10 and Windows 11 endpoints.
- Check whether Windows Sandbox is enabled, and verify the Sandbox build on each machine against the MSRC table.
- Limit local admin rights and review standard user accounts on shared PCs, terminal servers and staff laptops.
- Priority: medium. Remote or actively exploited vulnerabilities in the same release take precedence.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-119906 msrc.microsoft.com
- CVE Record: CVE-2026-119906 www.cve.org
- Strix: CVE-2026-119906 www.strix.ai
- Newsbeep: Microsoft November 2026 Patch Tuesday www.newsbeep.com
- Qualys: Microsoft Patch Tuesday November 2026 review blog.qualys.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 03:41.
Original description (NVD)
Improper neutralization of special elements used in an os command ('os command injection') in Windows Sandbox allows an authorized attacker to elevate privileges locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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