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Vulnerability record · CVE-2012-4776 · published 14 November 2012

CVE-2012-4776: Microsoft .net framework improper input validation vulnerability

Microsoft · .Net Framework

The Web Proxy Auto-Discovery (WPAD) functionality in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not validate configuration data that is returned during acquisition of proxy settings, which allows remote attackers to execute arbitrary JavaScript code by providing crafted data during execution of (1) an XAML browser application (aka XBAP) or (2) a .NET Framework application, aka "Web Proxy Auto-Discovery Vulnerability."

9.3 CVSS 2.0 High EPSS 25% · top 2.2% CWE-20 · Improper input validation
9.3CVSS 2.0 base score
25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References
16 Jun 2026Last modified by NVD

Description

The Web Proxy Auto-Discovery (WPAD) functionality in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not validate configuration data that is returned during acquisition of proxy settings, which allows remote attackers to execute arbitrary JavaScript code by providing crafted data during execution of (1) an XAML browser application (aka XBAP) or (2) a .NET Framework application, aka "Web Proxy Auto-Discovery Vulnerability."

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://osvdb.org/87266
http://secunia.com/advisories/51236
http://www.securityfocus.com/bid/56463
http://www.securitytracker.com/id?1027753
http://www.us-cert.gov/cas/techalerts/TA12-318A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-074
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15810
http://osvdb.org/87266
http://secunia.com/advisories/51236
http://www.securityfocus.com/bid/56463
http://www.securitytracker.com/id?1027753
http://www.us-cert.gov/cas/techalerts/TA12-318A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-074
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15810

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2012-4776), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.