{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-42978: Windows Push Notifications Elevation of Privilege Vulnerability","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-42978","status":"final","version":"1","initial_release_date":"2026-06-09T17:06:14.029Z","current_release_date":"2026-06-10T17:55:01.189Z","revision_history":[{"date":"2026-06-09T17:06:14.029Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-42978 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-42978"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-42978"},{"category":"external","summary":"Windows Push Notifications Elevation of Privilege Vulnerability","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42978"}]},"product_tree":{"branches":[{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 10 Version 1809","branches":[{"category":"product_version_range","name":">=10.0.17763.0 <10.0.17763.8880","product":{"name":"Microsoft Windows 10 Version 1809 >=10.0.17763.0 <10.0.17763.8880","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_10_version_1809:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 10 Version 21H2","branches":[{"category":"product_version_range","name":">=10.0.19044.0 <10.0.19044.7417","product":{"name":"Microsoft Windows 10 Version 21H2 >=10.0.19044.0 <10.0.19044.7417","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_10_version_21h2:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 10 Version 22H2","branches":[{"category":"product_version_range","name":">=10.0.19045.0 <10.0.19045.7417","product":{"name":"Microsoft Windows 10 Version 22H2 >=10.0.19045.0 <10.0.19045.7417","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_10_version_22h2:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 11 version 23H2","branches":[{"category":"product_version_range","name":">=10.0.22631.0 <10.0.22631.7219","product":{"name":"Microsoft Windows 11 version 23H2 >=10.0.22631.0 <10.0.22631.7219","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_11_version_23h2:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 11 Version 23H2","branches":[{"category":"product_version_range","name":">=10.0.22631.0 <10.0.22631.7219","product":{"name":"Microsoft Windows 11 Version 23H2 >=10.0.22631.0 <10.0.22631.7219","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_11_version_23h2:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 11 Version 24H2","branches":[{"category":"product_version_range","name":">=10.0.26100.0 <10.0.26100.8655","product":{"name":"Microsoft Windows 11 Version 24H2 >=10.0.26100.0 <10.0.26100.8655","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_11_version_24h2:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 11 Version 25H2","branches":[{"category":"product_version_range","name":">=10.0.26200.0 <10.0.26200.8655","product":{"name":"Microsoft Windows 11 Version 25H2 >=10.0.26200.0 <10.0.26200.8655","product_id":"CSAFPID-7","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_11_version_25h2:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows 11 version 26H1","branches":[{"category":"product_version_range","name":">=10.0.28000.0 <10.0.28000.2269","product":{"name":"Microsoft Windows 11 version 26H1 >=10.0.28000.0 <10.0.28000.2269","product_id":"CSAFPID-8","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_11_version_26h1:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows Server 2019","branches":[{"category":"product_version_range","name":">=10.0.17763.0 <10.0.17763.8880","product":{"name":"Microsoft Windows Server 2019 >=10.0.17763.0 <10.0.17763.8880","product_id":"CSAFPID-9","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_server_2019:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows Server 2019 (Server Core installation)","branches":[{"category":"product_version_range","name":">=10.0.17763.0 <10.0.17763.8880","product":{"name":"Microsoft Windows Server 2019 (Server Core installation) >=10.0.17763.0 <10.0.17763.8880","product_id":"CSAFPID-10","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_server_2019_\\(server_core_installation\\):*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows Server 2022","branches":[{"category":"product_version_range","name":">=10.0.20348.0 <10.0.20348.5256","product":{"name":"Microsoft Windows Server 2022 >=10.0.20348.0 <10.0.20348.5256","product_id":"CSAFPID-11","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_server_2022:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows Server 2025","branches":[{"category":"product_version_range","name":">=10.0.26100.0 <10.0.26100.32995","product":{"name":"Microsoft Windows Server 2025 >=10.0.26100.0 <10.0.26100.32995","product_id":"CSAFPID-12","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_server_2025:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Microsoft","branches":[{"category":"product_name","name":"Windows Server 2025 (Server Core installation)","branches":[{"category":"product_version_range","name":">=10.0.26100.0 <10.0.26100.32995","product":{"name":"Microsoft Windows Server 2025 (Server Core installation) >=10.0.26100.0 <10.0.26100.32995","product_id":"CSAFPID-13","product_identification_helper":{"cpe":"cpe:2.3:a:microsoft:windows_server_2025_\\(server_core_installation\\):*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-42978","title":"Windows Push Notifications Elevation of Privilege Vulnerability","notes":[{"category":"description","text":"Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11","CSAFPID-12","CSAFPID-13"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","baseScore":7.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11","CSAFPID-12","CSAFPID-13"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 10.0.17763.8880, 10.0.19044.7417, 10.0.19045.7417, 10.0.20348.5256, 10.0.22631.7219, 10.0.26100.8655, 10.0.26100.32995, 10.0.26200.8655, 10.0.28000.2269.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8","CSAFPID-9","CSAFPID-10","CSAFPID-11","CSAFPID-12","CSAFPID-13"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42978"}]}]}