Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-21513 |
| Alert Source | CISA KEV - Active Exploitation |
| CVE Publication Year | 2026 |
| Date Published | 2026-02-10 |
| Vendor | Microsoft |
| Product | Windows |
| CVSS Score | 8.8 (high) |
| EPSS Score | No data |
| CISA KEV | Yes - confirmed active exploitation |
| Ransomware | Not confirmed |
| Remediation Deadline | 2026-03-03 |
Vulnerability Description
Microsoft Internet Explorer contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
Required Actions
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Who Is Affected?
This vulnerability affects Windows by Microsoft. Check if your organization uses this software and requires updates.
Sources
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