Microsoft Windows Phone Service: Local privilege escalation
Summary
A null pointer dereference in the Windows Phone Service allows an authorized local user to elevate their privileges. An attacker needs an existing local account and the attack is rated as complex (high attack complexity). Successful exploitation can give the attacker high impact on confidentiality, integrity and availability, with no user interaction required.
Affected
- Windows 10 Version 1607: 10.0.14393.0 to before 10.0.14393.9688
- Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7846
- Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7711
- Windows 11 Version 24H2: 10.0.26100.0 to before 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.0 to before 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9974
Note: the Windows 11 entries are listed in the CVE record, but secondary sources disagree on them. Verify on the MSRC page.
Fixed in
Fixed in the builds listed above (first fixed build per version, per the CVE record). Confirm the exact KB per Windows version on the MSRC page.
Workaround
Unknown.
Exploitation
- No exploitation in the wild known at the time of research.
- No public proof-of-concept known.
- CISA SSVC assessment: Exploitation none, Automatable no, Technical Impact total.
Our recommendation
- Install the November 2026 cumulative update for each affected Windows build as part of the regular patch cycle.
- Prioritise multi-user systems, terminal servers (RDS) and workstations where untrusted users have local accounts.
- Check the MSRC page for the exact fixed build and KB per version, and check Microsoft lifecycle dates for legacy versions (1607, 1809).
- Monitor for public exploit code and for changes in exploitation status.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Phone Service
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131087, KB5132061, KB5132043
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-96107 msrc.microsoft.com
- CVE.org record CVE-2026-96107 www.cve.org
- Strix: CVE-2026-96107 www.strix.ai
- Senserva: KB5131096 (possible patch lead, unverified) senserva.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, 07:38.
Original description (NVD)
Null pointer dereference in Windows Phone Service 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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