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Windows Server Update Service

CVE-2026-50328 — Windows Server Update Service (WSUS) Tampering Vulnerability

Important CVSS 7.5 2026-07 archive

Executive Summary

Uncaught exception in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Tampering
Released Jul 14 2026
Last Updated Jul 14 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known

CVSS Vector

ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

15 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1607 for 32-bit Systems 5099535 (Security Update) Important Tampering Yes
Windows 10 Version 1607 for x64-based Systems 5099535 (Security Update) Important Tampering Yes
Windows 10 Version 1809 for 32-bit Systems 5099538 (Security Update) Important Tampering Yes
Windows 10 Version 1809 for x64-based Systems 5099538 (Security Update) Important Tampering Yes
Windows Server 2012 5099445 (Monthly Rollup) Important Tampering Yes
Windows Server 2012 (Server Core installation) 5099445 (Monthly Rollup) Important Tampering Yes
Windows Server 2012 R2 5099444 (Monthly Rollup) Important Tampering Yes
Windows Server 2012 R2 (Server Core installation) 5099444 (Monthly Rollup) Important Tampering Yes
Windows Server 2016 5099535 (Security Update) Important Tampering Yes
Windows Server 2016 (Server Core installation) 5099535 (Security Update) Important Tampering Yes
Windows Server 2019 5099538 (Security Update) Important Tampering Yes
Windows Server 2019 (Server Core installation) 5099538 (Security Update) Important Tampering Yes
Windows Server 2022 5099540 (Security Update) Important Tampering Yes
Windows Server 2025 5099536 (Security Update) Important Tampering Yes
Windows Server 2025 (Server Core installation) 5099536 (Security Update) Important Tampering Yes

Patches

6 patches
Article Type Restart
5099535 Security Update Yes
5099538 Security Update Yes
5099445 Monthly Rollup Yes
5099444 Monthly Rollup Yes
5099540 Security Update Yes
5099536 Security Update Yes

Known Exploits

Acknowledgments

f7d8c52bec79e42795cf15888b85cbad

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