{"id":"CVE-2026-23656","aliases":["EUVD-2026-10579","GHSA-53j2-qxv2-hfqj"],"status":"published","title":"Windows App Installer Spoofing Vulnerability","description":"Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.","severity":{"version":"3.1","score":5.9,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00346,"percentile":0.28391,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-345"],"published":"2026-03-10T17:05:05Z","modified":"2026-06-19T18:17:48Z","products":[{"vendor":"microsoft","product":"windows app client for windows desktop"},{"vendor":"microsoft","product":"windows_app"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23656","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23656"},{"url":"https://github.com/advisories/GHSA-53j2-qxv2-hfqj"}],"sources":{"cve":[{"id":"CVE-2026-23656","title":"Windows App Installer Spoofing Vulnerability","description":"Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.","status":"published","published":"2026-03-10T17:05:05.497Z","modified":"2026-06-19T18:17:48.4Z","cvss":[{"version":"3.1","score":5.9,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T13:42:15.603999Z"}],"euvd":[{"id":"EUVD-2026-10579","description":"Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.","status":"published","published":"2026-03-10T17:05:05Z","modified":"2026-06-19T18:17:48Z","cvss":[{"version":"3.1","score":5.9,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T18:20:35.844489Z"}],"ghsa":[{"id":"GHSA-53j2-qxv2-hfqj","title":"Insufficient verification of data authenticity in Windows App Installer allows an unauthorized...","description":"Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.","status":"published","published":"2026-03-10T18:31:19Z","modified":"2026-03-10T18:31:24Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T15:06:32.038351Z"}],"nvd":[{"id":"CVE-2026-23656","description":"Insufficient verification of data authenticity in Windows App Installer allows an unauthorized attacker to perform spoofing over a network.","status":"published","published":"2026-03-10T18:18:13.9Z","modified":"2026-06-17T10:21:54.077Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-345"],"updated_at":"2026-11-02T14:12:08.279852Z"}]}}