{"id":"CVE-2004-0847","aliases":["EUVD-2004-0845","GHSA-wxfc-g96x-mm56"],"status":"published","title":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass...","description":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) \"\\\" (backslash) or (2) \"%5C\" (encoded backslash), aka \"Path Validation Vulnerability.\"","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.75702,"percentile":0.99525,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-22"],"published":"2004-10-06T04:00:00Z","modified":"2026-06-16T22:06:30Z","exploits":[{"source":"exploitdb","id":"EDB-24666","title":"Microsoft ASP.NET 1.x - URI Canonicalization Unauthorized Web Access","type":"webapps","platform":"asp","date":"2004-10-06","verified":true,"url":"https://www.exploit-db.com/exploits/24666"}],"products":[{"vendor":"microsoft","product":"asp.net"}],"references":[{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-004","tags":["vendor-advisory","x_refsource_MS","x_transferred"]},{"url":"http://sourceforge.net/mailarchive/forum.php?thread_id=5671607\u0026forum_id=24754","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4987","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred","Third Party Advisory"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA05-039A.html","tags":["third-party-advisory","x_refsource_CERT","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/17644","tags":["vdb-entry","x_refsource_XF","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A3556","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred","Third Party Advisory"]},{"url":"http://www.kb.cert.org/vuls/id/283646","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"http://www.securityfocus.com/bid/11342","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"http://archives.neohapsis.com/archives/ntbugtraq/2004-q3/0221.html","tags":["mailing-list","x_refsource_NTBUGTRAQ","x_transferred","Exploit","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2004-0847"},{"url":"https://github.com/advisories/GHSA-wxfc-g96x-mm56"}],"sources":{"cve":[{"id":"CVE-2004-0847","description":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) \"\\\" (backslash) or (2) \"%5C\" (encoded backslash), aka \"Path Validation Vulnerability.\"","status":"published","published":"2004-10-06T04:00:00Z","modified":"2024-08-08T00:31:47.674Z","updated_at":"2026-11-02T14:34:54.398187Z"}],"euvd":[{"id":"EUVD-2004-0845","description":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) \"\\\" (backslash) or (2) \"%5C\" (encoded backslash), aka \"Path Validation Vulnerability.\"","status":"published","published":"2004-10-06T04:00:00Z","modified":"2024-08-08T00:31:47Z","updated_at":"2026-11-03T01:15:17.778038Z"}],"ghsa":[{"id":"GHSA-wxfc-g96x-mm56","title":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass...","description":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) \"\\\" (backslash) or (2) \"%5C\" (encoded backslash), aka \"Path Validation Vulnerability.\"","status":"published","published":"2022-04-29T02:58:29Z","modified":"2023-01-30T05:03:03Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:46:45.547616Z"}],"nvd":[{"id":"CVE-2004-0847","description":"The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass authentication for .aspx files in restricted directories via a request containing a (1) \"\\\" (backslash) or (2) \"%5C\" (encoded backslash), aka \"Path Validation Vulnerability.\"","status":"published","published":"2004-11-03T05:00:00Z","modified":"2026-06-16T22:06:30.907Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:00:51.000028Z"}]}}