EUVD Vulnerability Catalog
Actively Exploited (KEV)
EUVD-2026-73889
Severity: HIGH
Base Score: 7.8
CVSS Version: 3.1
Vulnerability Description
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
CVSS Vector Analysis
Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
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Attack Vector (AV): Local
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Attack Complexity (AC): Low
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Privileges Required (PR): Low
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User Interaction (UI): None
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Scope (S): Unchanged
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Confidentiality Impact (C): High
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Integrity Impact (I): High
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Availability Impact (A): High
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E: F
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RL: O
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RC: Changed
Affected Vendors & Systems
Vendor
Microsoft
References & Advisory Links
Metadata Profile
Database Authority
European Union Agency for Cybersecurity (ENISA) EUVD
Assigner
microsoft
EPSS Probability
0
Known Aliases
GHSA-4j4j-2wjq-mxqj
CVE-2026-81963
Published On
2026-09-08
Last Updated
2026-09-09
Exploited Since
2026-09-08