Microsoft Windows Search Component: Link following leads to local privilege escalation
Summary
A link-following weakness (CWE-59) in the Microsoft Windows Search Component allows a locally authorized attacker to elevate privileges. The attacker needs a valid low-privilege account on the affected machine and must run code locally; the flaw is not remotely exploitable. CVSS 3.1 base score is 7.8 (High). No exploitation is known.
Affected
- Windows 10 Version 1607 (10.0.14393.0 before 10.0.14393.9612)
- Windows 10 Version 1809 (10.0.17763.0 before 10.0.17763.9376)
- Windows 10 Version 21H2 (10.0.19044.0 before 10.0.19044.7807)
- Windows 10 Version 22H2 (10.0.19045.0 before 10.0.19045.7807, unverified, see MSRC)
- Windows 11 Version 23H2 (10.0.22631.0 before 10.0.22631.7652)
- Windows 11 Version 24H2 (10.0.26100.0 before 10.0.26100.9711)
- Windows 11 Version 25H2 (10.0.26200.0 before 10.0.26200.9711)
- Windows 11 Version 26H1 (10.0.28000.0 before 10.0.28000.3231)
- Windows 11 Version 26H2 (10.0.26300.0 before 10.0.26300.9711)
- Windows Server 2012 and Server Core (6.2.9200.0 before 6.2.9200.26434)
- Windows Server 2012 R2 and Server Core (6.3.9600.0 before 6.3.9600.23470)
- Windows Server 2016 (10.0.14393.0 before 10.0.14393.9612)
Fixed in
- Security update released on Patch Tuesday, 13 October 2026, for each affected build (see the table above for fixed build numbers)
- KB numbers: check the MSRC page or the Windows Update Catalog
Workaround
Unknown. No vendor-documented workaround. Installing the update is the fix.
Exploitation
- CISA KEV: not listed
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total
- EPSS about 0.4 to 0.5 percent
- No public proof of concept found in research (not exhaustively verified)
Our recommendation
- Apply the October 2026 Microsoft security update to all affected Windows builds, prioritising multi-user systems and Remote Desktop or terminal servers.
- Verify build numbers on the MSRC page before rollout, because the sources disagree on the Windows 10 22H2 fixed build.
- Check whether Windows 10 Version 1607 is still supported and plan an upgrade if it is in use.
- Limit local logon rights and local administrator rights to reduce the risk until patching is complete.
- Monitor for unusual privilege changes on endpoints.
- Priority: moderate, patch in the next regular cycle.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Microsoft Windows Search Component
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation more likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5126651, KB5126655, KB5126657, KB5126646, KB5127648, KB5126653
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-83704 msrc.microsoft.com
- Talos: Microsoft Patch Tuesday for October 2026 blog.talosintelligence.com
- OpenCVE: CVE-2026-83704 app.opencve.io
- Vulners: NVD CVE-2026-83704 vulners.com
- Vulners: MS CVE-2026-83704 vulners.com
- Qualys: Microsoft Patch Tuesday October 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 2 Nov 2026, 03:16.
Original description (NVD)
Improper link resolution before file access ('link following') in Microsoft Windows Search Component 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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