CWE-180Incorrect Behavior Order: Validate Before Canonicalize

Description

The product validates input before it is canonicalized.

Common consequences

• Access Control→Bypass Protection Mechanism
  This prevents the product from detecting data that becomes invalid after the canonicalization step. An attacker can bypass the validation and launch attacks that expose weaknesses that would otherwise be prevented, such as injection.

Potential mitigations

• Implementation
  Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

Related CWEs

Recent CVEs classified under this CWE