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2976 articles · 110847 vulns · 36/41 feeds (7d)
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7.5
CVE-2026-26154EXPLOITEDPATCHED
Microsoft · Windows Server 2012

Windows Server Update Service (WSUS) Tampering Vulnerability

Description

Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

Affected Products

VendorProductVersions
MicrosoftWindows Server 20126.2.9200.0, 6.2.9200.0, 6.3.9600.0, 6.3.9600.0, 10.0.14393.0, 10.0.14393.0, 10.0.17763.0, 10.0.17763.0, 10.0.20348.0, 10.0.25398.0, 10.0.26100.0, 10.0.26100.0

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
microsoftwindows server 2012 r2mitre_affected90%
microsoftwindowsmitre_affected90%
microsoftwindows server 2019 (server core installation)mitre_affected90%
microsoftwindows server 2016 (server core installation)mitre_affected90%
microsoftwindows server 2012 (server core installation)mitre_affected90%

References

  • https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154(vendor-advisory, patch)

Related News (2 articles)

Tier C
VulDB5h ago
CVE-2026-26154 | Microsoft
→ No new info (linked only)
Tier A
Microsoft MSRC9h ago
CVE-2026-26154 Windows Server Update Service (WSUS) Tampering Vulnerability
→ No new info (linked only)
CVSS 3.17.5 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CISA KEV❌ No
Actively exploited✅ Yes
Patch available
6.2.9200.260266.3.9600.2313210.0.14393.906010.0.17763.864410.0.20348.502010.0.25398.227410.0.26100.32690
CWECWE-20
PublishedApr 14, 2026
Last enriched6h agov2
Tags
WSUStampering
Trending Score66
Source articles2
Independent2
Info Completeness9/14
Missing: title, epss, kev, iocs, mitre_attack

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
Apr 14, 2026
Discovered by ZDM
Apr 14, 2026
Updated: description, exploitAvailable, activelyExploited, tags
Apr 14, 2026
Actively Exploited
Apr 14, 2026
Exploit Available
Apr 14, 2026
Patch Available
Apr 14, 2026

Version History

v2
Last enriched 6h ago
v2Tier A6h ago

Added a detailed description of the vulnerability, marked it as actively exploited, and included new tags related to WSUS and tampering.

descriptionexploitAvailableactivelyExploitedtags
via Microsoft MSRC
v16h ago

Initial creation