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5034 articles · 188809 vulns · 37/41 feeds (7d)
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8.8
CVE-2026-21510KEVEXPLOITEDPATCHED
microsoft · windows_10_1607

Windows Shell Security Feature Bypass Vulnerability

Description

Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

Affected Products

VendorProductVersions
microsoftwindows_10_160710.0.14393.0, 10.0.17763.0, 10.0.19044.0, 10.0.19045.0, 10.0.22631.0, 10.0.22631.0, 10.0.26100.0, 10.0.26200.0, 10.0.28000.0, 10.0.28000.0, 6.2.9200.0, 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_2016cve_cpe95%
microsoftwindows_server_2019cve_cpe95%
microsoftwindows_11_24h2cve_cpe95%
microsoftwindows_11_25h2cve_cpe95%
microsoftwindows_server_2012cve_cpe95%

References

  • https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510(vendor-advisory, patch)

Related News (5 articles)

Tier B
JPCERT/CC
Security Alert: Microsoft Releases February 2026 Security Updates
→ No new info (linked only)
Tier D
Help Net Security101d ago
Week in review: High-severity LPE vulnerability in the Linux kernel, cPanel 0-day exploited for months
→ No new info (linked only)
Tier D
BleepingComputer105d ago
CISA orders feds to patch Windows flaw exploited as zero-day
→ No new info (linked only)
Tier D
Heise Security106d ago
Windows-Shell-Lücke wird angegriffen
→ No new info (linked only)
Tier D
SecurityWeek107d ago
Incomplete Windows Patch Opens Door to Zero-Click Attacks
→ No new info (linked only)
CVSS 3.18.8 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
CISA KEV✅ Yes
Actively exploited✅ Yes
Patch available
10.0.14393.886810.0.17763.838910.0.19044.693710.0.19045.693710.0.22631.664910.0.26100.778110.0.26200.778110.0.20348.471110.0.25398.214910.0.26100.32313
CWECWE-693
PublishedFeb 10, 2026
Last enriched106d agov4
Tags
security feature bypasszero-click attackremote code executionspoofing attackzero-click vulnerability
Trending Score0
Source articles5
Independent5
Info Completeness12/14
Missing: epss, mitre_attack

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CRITICALCVE-2026-55040EXPKEV
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HIGHCVE-2026-45659EXPKEV
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HIGHCVE-2026-50656EXP
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Verification

State: verified
Confidence: 100%

Vulnerability Timeline

CVE Published
Feb 10, 2026
Added to CISA KEV
Feb 10, 2026
Discovered by ZDM
Apr 1, 2026
Updated: tags
Apr 1, 2026
Updated: cweIds, tags
Apr 27, 2026
Updated: severity, cvssEstimate, iocs, tags
Apr 28, 2026
Actively Exploited
May 11, 2026
Exploit Available
May 11, 2026
Patch Available
May 11, 2026

Version History

v4
Last enriched 106d ago
v4Tier D106d ago

Updated severity to MEDIUM and CVSS to 4.3, added new IOC domain 'attacker.com' and new tags related to spoofing and zero-click vulnerabilities.

severitycvssEstimateiocstags
via Heise Security
v3Tier D107d ago

Updated description with details on zero-click attacks and added new CWE and tags related to the vulnerability.

cweIdstags
via SecurityWeek
v2Tier B132d ago

Updated severity to CRITICAL, CVSS score to 9.8, and added new tag 'security feature bypass'.

tags
via JPCERT/CC
v1132d ago

Initial creation