Windows Broadcast DVR User Service: Use-after-free leads to privilege escalation
Summary
A use-after-free vulnerability in the Windows Broadcast DVR User Service allows an attacker with an existing low-privilege local account to elevate privileges. The attack requires local access and high attack complexity, and it does not need user interaction. Successful exploitation would give the attacker high confidentiality, integrity and availability impact on the affected system.
Affected
- 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
Fixed in
- Windows 10 1809, 21H2 and 22H2: fixed builds per the CVE record (10.0.17763.9487, 10.0.19044.7846, 10.0.19045.7846)
- Windows 11 23H2, 24H2, 25H2, 26H1 and 26H2: fixed builds per a third-party mirror only (10.0.22631.7711, 10.0.26100.9974, 10.0.26200.9974, 10.0.28000.3501, 10.0.26300.9974); verify on the MSRC advisory before rollout
- KB numbers: Unknown.
Workaround
Unknown. No vendor workaround for this CVE was found in the sources reviewed.
Exploitation
- No known exploitation in the wild.
- No public proof of concept found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- CISA KEV status: not checked.
Our recommendation
- Install the November 2026 security update on all affected Windows 10 and Windows 11 systems, after confirming the fixed build on the MSRC advisory.
- Prioritise shared, unmanaged workstations and terminal servers.
- Review which accounts have local logon and limit standard user rights where possible.
- Monitor for unexpected privilege changes and new local administrator accounts.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Broadcast DVR User 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)
- KB5131085, KB5131096, KB5131087, KB5132061, KB5132043, KB5132059
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-119401 msrc.microsoft.com
- CVE.org record CVE-2026-119401 www.cve.org
- Strix.ai mirror CVE-2026-119401 (not authoritative) www.strix.ai
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, 08:46.
Original description (NVD)
Use after free in Windows Broadcast DVR User 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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