CVE-2026-21513: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
Other sources
MSHTML Framework Security Feature Bypass Vulnerability
— Microsoft
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.7840Fixed in 10.0.26100.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.26200.7840Fixed in 10.0.26200.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.14393.8868Patch KB5075999 - Upgrade
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Fixed in 10.0.26100.32370Fixed in 10.0.26100.32313Patch KB5075942 - Upgrade
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Fixed in 10.0.22631.6649Patch KB5075941 - Upgrade
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Fixed in 10.0.25398.2149Patch KB5075897 - Upgrade
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Fixed in 10.0.19045.6937Patch KB5075912 - Upgrade
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Fixed in 6.2.9200.25923Patch KB5075971 - Upgrade
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Fixed in 6.3.9600.23022Patch KB5075970 - Upgrade
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Fixed in 10.0.19044.6937Patch KB5075912 - Upgrade
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Fixed in 10.0.17763.8389Patch KB5075904 - Upgrade
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Fixed in 10.0.20348.4773Fixed in 10.0.20348.4711Patch KB5075943 - Upgrade
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Fixed in 10.0.28000.1575Patch KB5077179
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21513?
CVE-2026-21513 is classified as a security feature bypass vulnerability, posing significant risk as it allows attackers to bypass protective mechanisms.
How do I fix CVE-2026-21513?
To fix CVE-2026-21513, apply the latest patches provided by Microsoft for the affected Windows products.
Which products are affected by CVE-2026-21513?
CVE-2026-21513 affects various Microsoft Windows products, including Windows Server 2016, Windows 10, and Windows 11.
Can CVE-2026-21513 be exploited remotely?
Yes, CVE-2026-21513 can be exploited over a network, allowing unauthorized access to bypass security features.
What are the common impacts of CVE-2026-21513?
The primary impact of CVE-2026-21513 is the potential unauthorized access and manipulation of system features, compromising system security.