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"Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally."}], "id": "CVE-2026-21222", "lastModified": "2026-02-11T21:18:38.220", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-02-10T18:16:23.130", "references": [{"source": "secure@microsoft.com", "tags": ["Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21222"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-532"}], "source": "secure@microsoft.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.14393.0,10.0.14393.8868)"}}], "product": "windows_10_1607", "vendor": "microsoft"}, {"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.17763.0,10.0.17763.8389)"}}], "product": "windows_10_1809", "vendor": "microsoft"}, {"configurations": [{"platform": ["32-bit_systems", "arm64-based_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.19044.0,10.0.19044.6937)"}}], "product": "windows_10_21h2", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems", "arm64-based_systems", "32-bit_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.19045.0,10.0.19045.6937)"}}], "product": "windows_10_22h2", "vendor": "microsoft"}, {"configurations": [{"platform": ["arm64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.22631.0,10.0.22631.6649)"}}], "product": "windows_11_22h3", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.22631.0,10.0.22631.6649)"}}], "product": "windows_11_23h2", "vendor": "microsoft"}, {"configurations": [{"platform": ["arm64-based_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.7840)"}}], "product": "windows_11_24h2", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[6.3.9600.0,6.3.9600.23022)"}}], "product": "windows_server_2012_r2", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[6.3.9600.0,6.3.9600.23022)"}}], "product": "windows_server_2012_r2_(server_core_installation)", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.14393.0,10.0.14393.8868)"}}], "product": "windows_server_2016", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.14393.0,10.0.14393.8868)"}}], "product": "windows_server_2016_(server_core_installation)", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.17763.0,10.0.17763.8389)"}}], "product": "windows_server_2019", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.17763.0,10.0.17763.8389)"}}], "product": "windows_server_2019_(server_core_installation)", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.20348.0,10.0.20348.4773)"}}], "product": "windows_server_2022", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.25398.0,10.0.25398.2149)"}}], "product": "windows_server_2022,_23h2_edition_(server_core_installation)", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32370)"}}], "product": "windows_server_2025", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32370)"}}], "product": "windows_server_2025_(server_core_installation)", "vendor": "microsoft"}], "analysis": {"en": {"generated_at": "2026-04-15T16:18:11.042894+00:00", "value": {"mitigation_remediation": ["Install the official Microsoft security update that resolves CVE-2026-21222 via the Microsoft Security Update Guide.", "If the patch is not yet available, disable or remove any kernel logging mechanisms that record sensitive data, or configure logging to exclude confidential information.", "Enforce least\u2011privilege for local accounts, ensuring that only trusted administrators can access system logs, and consider using Windows Defender application control or AppLocker to prevent unauthorized execution of local code."], "summary": {"action": "Apply Patch", "impact": "Local Information Disclosure"}, "threat_synthesis": {"affected_systems": "Microsoft Windows desktop releases from Windows\u202f10\u202fVersion\u202f1607 through Windows\u202f11\u202fVersion\u202f24H2, as well as Windows\u202fServer\u202f2012\u202fR2 up through Windows\u202fServer\u202f2025, are affected. Each listed edition and architecture version listed by Microsoft \u2013 Win10 1607, 1809, 21H2, 22H2; Win11 22H3, 23H2, 24H2; and the corresponding Server editions, including Server\u2011Core variants \u2013 is impacted.", "description_and_impact": "The vulnerability stems from inserting sensitive data into a kernel log file, enabling an attacker who already has local system access to read those logs and expose confidential information. The flaw is a local information disclosure identified as CWE\u2011532. The attacker can gain access to sensitive data without needing remote access or privilege escalation beyond the local user\u2019s existing rights.", "risk_and_exploitability": "The CVSS v3.1 score of 5.5 indicates moderate severity, while the EPSS score of less than 1\u202f% suggests a very low likelihood of exploitation at this time. The vulnerability has not been added to the CISA KEV catalog. To exploit the flaw an adversary must already have authenticated local access or succeed in another local compromise; the attack vector is inferred to be local. Once the attacker obtains a user session, they can read the kernel\u2011level log file that contains the sensitive data, resulting in confidentiality loss for the affected system."}}}}, "created": "2026-02-12T12:22:41.088633+00:00", "updated": "2026-04-15T17:30:10.490864+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows_10_1607", "microsoft$PRODUCT$windows_10_1809", "microsoft$PRODUCT$windows_10_21h2", "microsoft$PRODUCT$windows_10_22h2", "microsoft$PRODUCT$windows_11_22h3", "microsoft$PRODUCT$windows_11_23h2", "microsoft$PRODUCT$windows_11_24h2", "microsoft$PRODUCT$windows_server_2012_r2", "microsoft$PRODUCT$windows_server_2012_r2_(server_core_installation)", "microsoft$PRODUCT$windows_server_2016", "microsoft$PRODUCT$windows_server_2016_(server_core_installation)", "microsoft$PRODUCT$windows_server_2019", "microsoft$PRODUCT$windows_server_2019_(server_core_installation)", "microsoft$PRODUCT$windows_server_2022", "microsoft$PRODUCT$windows_server_2022,_23h2_edition_(server_core_installation)", "microsoft$PRODUCT$windows_server_2025", "microsoft$PRODUCT$windows_server_2025_(server_core_installation)"]}