CVE-2012-4776 Cross-site scripting in n/a

What is CVE-2012-4776?

CVE-2012-4776 is a critical cross-site scripting vulnerability in Microsoft .Net Framework, published on 14 Nov 2012. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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."

Weakness: CWE-20

Which versions are affected by CVE-2012-4776?

It affects 1 product.

Products include Microsoft .Net Framework.

How do I fix CVE-2012-4776?

No fix has been published for CVE-2012-4776 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2012-4776 being exploited?

There is no known exploitation of CVE-2012-4776 in the wild and no public exploit code.

Other vulnerabilities in Microsoft .Net Framework

• CVE-2020-0646 Microsoft .NET Framework Remote Code Execution Exploited Critical 9.8
• CVE-2017-8759 Microsoft .NET Framework Remote Code Execution Exploited High 7.8
• CVE-2015-1671 Microsoft Windows Remote Code Execution Exploited High 7.8
• CVE-2024-29059 Microsoft .NET Framework Information Disclosure Exploited High 7.5
• CVE-2014-4073 Privilege escalation in n/a Critical 10.0

All Microsoft .Net Framework vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-7962-fqpx-4h4f.