CVE-2026-83507
Analyzed Analyzed - Analysis Complete

Improper Link Resolution Leading to Local Information Disclosure in Windows Update Orchestrator Service

Publication date: 2026-10-13

Last updated on: 2026-10-28

Assigner: Microsoft Corporation

Description
Improper link resolution before file access ('link following') in Windows Update Orchestrator Service allows an authorized attacker to disclose information locally.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-28
Generated
2026-11-08
AI Q&A
2026-10-14
EPSS Evaluated
2026-11-07
NVD
CVE-2026-83507
EUVD
EUVD-2026-99905

Affected Vendors & Products

Showing 18 associated CPEs
Vendor Product Version / Range
microsoft windows_10_21h2 to 10.0.19044.7807 (exc)
microsoft windows_10_21h2 to 10.0.19044.7807 (exc)
microsoft windows_10_21h2 to 10.0.19044.7807 (exc)
microsoft windows_11_23h2 to 10.0.22631.7652 (exc)
microsoft windows_11_23h2 to 10.0.22631.7652 (exc)
microsoft windows_11_24h2 to 10.0.26100.9711 (exc)
microsoft windows_11_24h2 to 10.0.26100.9711 (exc)
microsoft windows_11_25h2 to 10.0.26200.9711 (exc)
microsoft windows_11_25h2 to 10.0.26200.9711 (exc)
microsoft windows_11_26h1 to 10.0.28000.3231 (exc)
microsoft windows_11_26h1 to 10.0.28000.3231 (exc)
microsoft windows_11_26h2 to 10.0.26300.9711 (exc)
microsoft windows_11_26h2 to 10.0.26300.9711 (exc)
microsoft windows_server_2025 to 10.0.26100.33650 (exc)
microsoft windows_server_2022 to 10.0.20348.5761 (exc)
microsoft windows_10_22h2 to 10.0.19045.7807 (exc)
microsoft windows_10_22h2 to 10.0.19045.7807 (exc)
microsoft windows_10_22h2 to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-59 The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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Executive Summary

This vulnerability involves improper link resolution in the Windows Update Orchestrator Service. An authorized attacker can exploit this to follow symbolic links and access files they shouldn't, leading to local information disclosure.

Impact Analysis

An attacker with local access could exploit this to read sensitive files on your system, potentially exposing personal data, credentials, or other confidential information.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or health data, violating GDPR or HIPAA requirements for data protection and confidentiality.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Update Orchestrator Service vulnerability. Monitor Microsoft's security advisories for patches and install them promptly.

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