CVE-2026-23656

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23656", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-01-14T16:59:33.462Z", "datePublished": "2026-03-10T17:05:05.497Z", "dateUpdated": "2026-06-19T18:17:48.400Z"}, "containers": {"cna": {"title": "Windows App Installer Spoofing Vulnerability", "datePublic": "2026-03-10T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:windows_app_client_for_windows_desktop:*:*:*:*:*:windows:*:*", "versionStartIncluding": "1.00", "versionEndExcluding": "2.0.964"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Windows App Client for Windows Desktop", "versions": [{"version": "1.00", "lessThan": "2.0.964", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-345: Insufficient Verification of Data Authenticity", "lang": "en-US", "type": "CWE", "cweId": "CWE-345"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-06-19T18:17:48.400Z"}, "references": [{"name": "Windows App Installer Spoofing Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.9, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-11T14:52:32.551961Z", "id": "CVE-2026-23656", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-11T14:52:58.967Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23656", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-11T14:52:32.551961Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-11T14:52:53.052Z"}}], "cna": {"title": "Windows App Installer Spoofing Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 5.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": "Windows App Client for Windows Desktop", "versions": [{"status": "affected", "version": "1.00", "lessThan": "2.0.964", "versionType": "custom"}]}], "datePublic": "2026-03-10T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656", "name": "Windows App Installer Spoofing Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-345", "description": "CWE-345: Insufficient Verification of Data Authenticity"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:windows_app_client_for_windows_desktop:*:*:*:*:*:windows:*:*", "vulnerable": true, "versionEndExcluding": "2.0.964", "versionStartIncluding": "1.00"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-06-19T18:17:48.400Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23656", "state": "PUBLISHED", "dateUpdated": "2026-06-19T18:17:48.400Z", "dateReserved": "2026-01-14T16:59:33.462Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-03-10T17:05:05.497Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "Windows App Client for Windows Desktop", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.964", "status": "affected", "version": "1.00", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:windows_app:*:*:*:*:*:windows:*:*", "matchCriteriaId": "6AEA65A6-BF6A-4C20-B8F8-B3A1DB1988AE", "versionEndExcluding": "2.0.964.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network."}, {"lang": "es", "value": "Verificaci\u00f3n insuficiente de la autenticidad de los datos en el Instalador de Aplicaciones de Windows permite a un atacante no autorizado realizar suplantaci\u00f3n a trav\u00e9s de una red."}], "id": "CVE-2026-23656", "lastModified": "2026-06-17T10:21:54.077", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23656", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-11T14:52:32.551961Z", "version": "2.0.3"}}]}, "published": "2026-03-10T18:18:13.900", "references": [{"source": "secure@microsoft.com", "tags": ["Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.00,2.0.964)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Windows App Client for Windows Desktop", "source": "cna", "vendor": "Microsoft"}, "product": "windows_app_client_for_windows_desktop", "vendor": "microsoft"}], "analysis": {"en": {"generated_at": "2026-03-17T00:08:19.764985+00:00", "value": {"mitigation_remediation": ["Apply the latest Windows App Client update from Microsoft"], "summary": {"action": "Patch Now", "impact": "Spoofing / Impersonation"}, "threat_synthesis": {"affected_systems": "The affected products are Microsoft Windows App Client for Windows Desktop. No specific version information is supplied, meaning all current installations of this product may be vulnerable until a vendor update is applied.", "description_and_impact": "Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network. This vulnerability is a classic data authenticity failure (CWE-345). The primary impact is the ability to impersonate legitimate app installers, undermining trust in update delivery.", "risk_and_exploitability": "CVSS score 5.9 indicates moderate severity. EPSS score is less than 1%, suggesting low likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. Based on the description, it is inferred that the attack vector is network-based spoofing of installation data, but no detailed exploitation path is disclosed."}}}}, "created": "2026-03-11T11:45:46.913102+00:00", "updated": "2026-03-20T14:34:21.344693+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows_app_client_for_windows_desktop"]}