What this vulnerability really changes CVE-2026-21510 is categorized as a protection mechanism failure in Windows Shell that allows an unauthorized attacker to bypass a security feature over a network, with a CVSS v3.1 base score of 8.8 and vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. (NVD) That vector matters. This is not “remote code execution with zero clicks.” It’s worse … Continue reading CVE-2026-21510 PoC: The SmartScreen Moment That Never Happens