CWE-179Incorrect Behavior Order: Early Validation

Description

The product validates input before applying protection mechanisms that modify the input.

Common consequences

• Access Control,Integrity→Bypass Protection Mechanism,Execute Unauthorized Code or Commands
  An attacker could bypass the protection mechanism by including dangerous inputs that are only produced after the modification (such as canonicalization and cleansing). This can be used to launch various attacks including injection, executin

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