CVE-2026-21513 — Actively Exploited: Windows (Microsoft)
Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
| CVE ID | CVE-2026-21513 |
|---|---|
| Vendor | Microsoft |
| Product | Windows |
| Vulnerability name | Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability |
| Date added | 2026-02-10 |
| Remediation due | 2026-03-03 |
| Known ransomware use | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
| Description | Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network. |
| Source | CISA Known Exploited Vulnerabilities |
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