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CVE-2004-0847

CRITICAL

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."

Published: Nov 3, 2004 Modified: Jun 16, 2026
CWE-22

CVSS Metrics

CVSSv3
Attack Vector: NETWORK Attack Complexity: LOW Privileges Required: NONE User Interaction: NONE Scope: UNCHANGED Confidentiality Impact: HIGH Integrity Impact: HIGH Availability Impact: HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products (2)

Vendor Product Version
microsoft asp.net *
microsoft asp.net 1.1

GitHub Security Advisory GHSA-wxfc-g96x-mm56

The Microsoft .NET forms authentication capability for ASP.NET allows remote attackers to bypass...

Risk Scores

CVSS Score 9.8 / 10
EPSS Score 75.70%

Top 1% most likely to be exploited

Threat Score 71.9 / 100

Data Sources

NVD EPSS GitHub