Overposting
Overposting is a security vulnerability in which client-supplied fields are automatically bound to application properties that were not intended for client modification.
Secure APIs
Mass assignment is an object-binding behavior that maps multiple client-supplied fields directly onto an application's object or model.
- How it is used
- Uses payment APIs to show how unrestricted field binding can let clients override business-critical state.
- How deep it goes
- Explains the failure mode, consequences, vulnerable and constrained implementations, but does not detail framework-specific internals.
- Examples
- Uses payment-status payloads, Ruby on Rails binding, and Python request schemas to demonstrate exploitation and prevention.
- What you can do after
- Diagnose unrestricted model binding and apply operation-specific request schemas that exclude server-controlled fields.
ASP.NET Core in Action, 3e
Overposting is a security vulnerability in which client-supplied fields are bound directly to properties that the application did not intend to expose for modification.
- How it is used
- Protects create and edit operations from unintended client-controlled property changes.
- How deep it goes
- Defines the vulnerability and demonstrates explicit mapping, but does not show a concrete attack payload.
- Examples
- Uses CreateRecipeCommand-to-Recipe mapping and a Razor Pages InputModel with selective property binding.
- What you can do after
- Apply it via purpose-specific binding models and explicit property mapping before persistence.
Related concepts
- protected attributesaddressed by · Protected attributes are model properties configured to reject direct assignment through a mass-assignment mechanism.
- validationaddressed by · The process of checking data, behavior, systems, models, or results against defined criteria to assess their correctness, suitability, or acceptability.
- sanitizationaddressed by · Sanitization is the process of checking, modifying, removing, or normalizing data to meet relevant safety, privacy, consistency, or domain requirements before use or sharing.
- secure by designused by · Secure by design is an engineering approach that incorporates security requirements and protections throughout a system’s design, development, and lifecycle.
- vulnerabilitykind of · A vulnerability is a weakness or susceptibility in a system, process, or person that can expose it to harm, misuse, failure, or compromise.
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