{"id":"CVE-2026-20806","title":"Windows COM Server Information Disclosure Vulnerability","summary":"Access of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-843"],"vendor":"Microsoft","product":"Windows 10 Version 1809","affected":["windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.8644","windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7184","windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7184","windows_11_version_22h3 >= 10.0.22631.0 < 10.0.22631.6936","windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.6936","windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8246","windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8246","windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.1836","windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8644","windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.8644","windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5020","windows_server_2022_23h2_edition_server_core_installation >= 10.0.25398.0 < 10.0.25398.2274","windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32690","windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.32690"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-04-14T19:29:34.522671Z"},"published":"2026-04-14","updated":"2026-09-25","sourceUpdated":"2026-09-25T17:25:36.627Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-20806","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20806","label":"Windows COM Server Information Disclosure Vulnerability"}],"tags":["cve.org"],"epss":0.00341,"epssPercentile":0.24799,"ingestedAt":"2026-09-25T18:14:20.439Z","slug":"CVE-2026-20806","body":"## Overview\n\nAccess of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.\n\n## Affected\n\n- `windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.8644`\n- `windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7184`\n- `windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7184`\n- `windows_11_version_22h3 >= 10.0.22631.0 < 10.0.22631.6936`\n- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.6936`\n- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8246`\n- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8246`\n- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.1836`\n- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.8644`\n- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.8644`\n- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5020`\n- `windows_server_2022_23h2_edition_server_core_installation >= 10.0.25398.0 < 10.0.25398.2274`\n- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32690`\n- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.32690`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}