The default configuration of ASP.NET in Mono before 2.6.4 has a value of FALSE for the EnableViewStateMac property, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by the VIEWSTATE parameter to 2.0/menu/menu1.aspx in the XSP sample project.

The System.CodeDom.Compiler classes in Novell Mono create temporary files with insecure permissions, which allows local users to overwrite arbitrary files or execute arbitrary code via a symlink attack.

Multiple cross-site scripting (XSS) vulnerabilities in the Mono 1.0.5 implementation of ASP.NET (.Net) allow remote attackers to inject arbitrary HTML or web script via Unicode representations for ASCII fullwidth characters that are converted to normal ASCII characters, including ">" and "<".

Buffer overflow in the Mono.Math.BigInteger class in Mono 1.2.5.1 and earlier allows context-dependent attackers to execute arbitrary code via unspecified vectors related to Reduce in Montgomery-based Pow methods.

Mono, when Moonlight before 2.3.0.1 or 2.99.x before 2.99.0.10 is used, does not properly validate arguments to generic methods, which allows remote attackers to bypass generic constraints, and possibly execute arbitrary code, via a crafted method call.

Unspecified vulnerability in the modmono module for XSP in Mono 2.8.x before 2.8.2 allows remote attackers to obtain the source code for .aspx (ASP.NET) applications via unknown vectors related to an "unloading bug."

Untrusted search path vulnerability in metadata/loader.c in Mono 2.8 and earlier allows local users to gain privileges via a Trojan horse shared library in the current working directory.

Cross-site scripting (XSS) vulnerability in the ProcessRequest function in mcs/class/System.Web/System.Web/HttpForbiddenHandler.cs in Mono 2.10.8 and earlier allows remote attackers to inject arbitrary web script or HTML via a file with a crafted name and a forbidden extension, which is not properly handled in an error message.