{"cve_id":"CVE-2026-21510","published":"2026-02-10T18:16:33.170000+00:00","last_modified":"2026-06-17T10:18:45.110000+00:00","vuln_status":"Analyzed","description":"Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","base_score":8.8,"base_severity":"HIGH","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"REQUIRED","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-693"],"in_kev":true,"kev_date_added":"2026-02-10","kev_ransomware":false,"epss_score":0.61238,"epss_percentile":0.99162,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":true,"grant_access":"USER","caps":["CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T11:56:40.726858+00:00","first_seen":"2026-02-10T18:16:33.170000+00:00","kev_first_seen":"2026-02-10T00:00:00+00:00","novelty_score":59.85,"novelty_reasons":["EPSS_SPIKE","HIGH_LEVERAGE_STEPPING_STONE","REACHES_TERMINAL","RAISES_REACH_COMMON_PRODUCT"],"novelty_at":"2026-11-02T03:21:44.260683+00:00","vendors":["microsoft"],"products":["windows_10_1607","windows_10_1809","windows_10_21h2","windows_10_22h2","windows_11_23h2","windows_11_24h2","windows_11_25h2","windows_server_2012","windows_server_2016","windows_server_2019","windows_server_2022","windows_server_2022_23h2","windows_server_2025"],"affected":[{"vendor":"microsoft","product":"windows_10_1607","ranges":["< 10.0.14393.8868"]},{"vendor":"microsoft","product":"windows_10_1809","ranges":["< 10.0.17763.8389"]},{"vendor":"microsoft","product":"windows_10_21h2","ranges":["< 10.0.19044.6937"]},{"vendor":"microsoft","product":"windows_10_22h2","ranges":["< 10.0.19045.6937"]},{"vendor":"microsoft","product":"windows_11_23h2","ranges":["< 10.0.22631.6649"]},{"vendor":"microsoft","product":"windows_11_24h2","ranges":["< 10.0.26100.7781"]},{"vendor":"microsoft","product":"windows_11_25h2","ranges":["< 10.0.26200.7781"]},{"vendor":"microsoft","product":"windows_server_2012","ranges":["all versions","r2"]},{"vendor":"microsoft","product":"windows_server_2016","ranges":["< 10.0.14393.8868"]},{"vendor":"microsoft","product":"windows_server_2019","ranges":["< 10.0.17763.8389"]},{"vendor":"microsoft","product":"windows_server_2022","ranges":["< 10.0.20348.4711"]},{"vendor":"microsoft","product":"windows_server_2022_23h2","ranges":["< 10.0.25398.2149"]},{"vendor":"microsoft","product":"windows_server_2025","ranges":["< 10.0.26100.32313"]}]}