C#: The cs/web/missing-token-validation query now recognizes an ASP.NET Core AutoValidateAntiforgeryTokenAttribute.

[michaelnebel]

The content of this PR addresses the comment seen here. There exists a "global" auto validate for ASP.NET as explained here.
The compilation is now also taken into account when auto "global" validation is enabled.

[Copilot]

Copilot review overview

Review tier: Balanced
Findings: 1

New issues introduced by this change (1)

Severity	Finding
	csharp/​ql/​src/​Security Features/​CWE-352/​MissingAntiForgeryTokenValidation.ql — FilterCollection.Add(Type) is a supported overload (and is present in the loaded stub), but…

What changed in this PR

Adds ASP.NET Core global antiforgery-filter recognition to reduce false positives in the C# CSRF query.

Changes:

• Models MVC registrations and global AutoValidateAntiforgeryTokenAttribute filters.
• Scopes global filters and middleware to the controller compilation.
• Adds regression coverage and a change note.

File	Description
MissingAntiForgeryTokenValidation.ql	Detects compilation-scoped global filters.
AspNetCore.qll	Models filter registrations and generic Add.
global-aspnetcore/​options	Loads ASP.NET Core stubs.
global-aspnetcore/​MissingAntiForgeryTokenValidation.qlref	Selects the tested query.
global-aspnetcore/​MissingAntiForgeryTokenValidation.expected	Expects no alerts.
global-aspnetcore/​MissingAntiForgeryTokenValidation.cs	Adds a global-filter regression case.
2026-08-27-csrf-autovalidate.md	Documents the analysis improvement.

Suppressed comments (2)

csharp/ql/src/Security Features/CWE-352/MissingAntiForgeryTokenValidation.ql:146

• A global AutoValidateAntiforgeryTokenAttribute can be overridden on a controller or action with [IgnoreAntiforgeryToken], but this condition removes every POST action in the compilation before action metadata is considered. Consequently, explicitly unprotected actions are never reported. Model the effective ignore attribute and exempt those actions from the global-filter suppression.

    not hasGlobalAspNetMvcAntiForgeryFilter(compilation)

csharp/ql/src/Security Features/CWE-352/MissingAntiForgeryTokenValidation.ql:59

• The test only exercises Add(new AutoValidateAntiforgeryTokenAttribute()), while the new generic-target branch for Filters.Add<AutoValidateAntiforgeryTokenAttribute>() has no existing coverage. Add an isolated generic-registration case so the object registration cannot mask whether generic method extraction works.

      addGlobalFilter.getTarget().(ConstructedGeneric).getTypeArgument(0) instanceof
        AspNetCore::AutoValidateAntiforgeryTokenAttribute

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