CVE-2026-21513Vulnerability
Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Exploited in the wildCISA added it to its Known Exploited Vulnerabilities list on .
Reported by 2 independent sources · first reported by Trend Micro Research · last reported
Last reported 3 months ago
CISA KEVAdded 10 Feb 2026
Fix due 3 Mar 2026
Used by ransomware: not knownCISA KEV catalogue
Fix due 3 Mar 2026
Used by ransomware: not knownCISA KEV catalogue
EPSS15.9%
higher than 96% of CVEsFIRST EPSS, as of 23 Oct 2026
higher than 96% of CVEsFIRST EPSS, as of 23 Oct 2026
What the reports say
2 reports, newest first · the exact sentence from each-
June 2026 CVE Landscape“CVE-2026-21513”
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Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities“Pawn Storm actively exploited multiple vulnerabilities, including a confirmed Windows zero-day (CVE-2026-21513).”
Indicators reported together
named in the same reportsAlso named with it: CVE-2026-21509, CVE-2026-25089, CVE-2026-39808, CVE-2026-11645, CVE-2026-28318, CVE-2026-20230, CVE-2026-35616, CVE-2026-33825, CVE-2025-55182, CVE-2025-8088, CVE-2025-6218, CVE-2026-35273, CVE-2021-27137, CVE-2026-46817, CVE-2026-48907, CVE-2026-12569, CVE-2022-27925, CVE-2023-46747, CVE-2026-25939, CVE-2020-17103
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