Microsoft Windows Task Scheduler: Elevation of privilege through improper authorization
Summary
A flaw in the Windows Task Scheduler allows an authorized local user to gain higher privileges. The CVSS vector rates confidentiality, integrity and availability impact as high. Exploitation requires a local account with low privileges and no user interaction, so the risk is mainly for shared systems such as terminal servers and multi-user PCs.
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
- Windows Server 2016 (including Server Core): 10.0.14393.0 to before 10.0.14393.9688
- Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9487
- Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5870
Fixed in
- Windows 10 Version 1607 and Windows Server 2016: 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019: 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.7846
- Windows 11 Version 23H2: 10.0.22631.7711
- Windows 11 Version 24H2: 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.9974
- Windows Server 2022: 10.0.20348.5870
- Confirm the builds in the MSRC Security Update Guide before rollout.
Workaround
Unknown.
Exploitation
- No public exploit code found at the time of analysis.
- No known exploitation in the wild found; CISA KEV was not checked in this analysis.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Install the Microsoft security update for the affected Windows versions as soon as possible, prioritising terminal servers and shared multi-user systems.
- Check your inventory for the affected builds and verify the exact fixed builds in the MSRC Security Update Guide.
- Review the Microsoft lifecycle pages for older Windows 10 and Server editions still in use.
- Monitor CISA KEV and NVD for changes to exploitation status and watch for published proof-of-concept code.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Task Scheduler
- 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, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide (MSRC) msrc.microsoft.com
- CVE Record (Microsoft CNA) www.cve.org
- Tenable: Microsoft November 2026 Patch Tuesday www.tenable.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, 03:16.
Original description (NVD)
Improper authorization in Windows Task Scheduler 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.
Affected? We can help.
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