ExpressionSecurityValidator (The Adobe AEM Quickstart and Web Application. 6.6.2)

```
public interface ExpressionSecurityValidator
```
Service interface for EL expression security validation. This service can be used by other bundles to validate EL expressions for security issues.
The validation process includes checking for:
- Configurable denylist patterns (checked first)
- Static allowlist for AEM solution expressions
- Customer configurable allowlist
- Arithmetic expressions that might indicate injection
- Dangerous class access patterns
Since:

5.10.15

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`sanitizeExpression(java.lang.String expression)`	Sanitizes an EL expression by removing dangerous content.
`void`	`validateExpression(java.lang.String expression)`	Validates an EL expression for security issues.

- Method Detail
  - validateExpression
```
void validateExpression(java.lang.String expression)
                 throws javax.el.ELException
```
    Validates an EL expression for security issues.
    
    Parameters:
    
    expression - The EL expression to validate
    
    Throws:
    
    javax.el.ELException - if the expression contains dangerous patterns
  - sanitizeExpression
```
java.lang.String sanitizeExpression(java.lang.String expression)
```
    Sanitizes an EL expression by removing dangerous content.
    
    Parameters:
    
    expression - The EL expression to sanitize
    
    Returns:
    
    A safe version of the expression