CMB2 Plugin 2.13.1 Input Validation Flaw Leading to XSS/SQLi

Vulnerability Overview The provided screenshot displays a file named , which is part of the CMB2 plugin. A potential security vulnerability exists within this file, manifested as insufficient validation and sanitization of user input during processing, which may lead to security breaches. Impact Scope Affected Versions: CMB2 Plugin version 2.13.1. Affected Functionality: The vulnerability potentially impacts all websites using the CMB2 plugin, particularly those relying on this plugin for custom field management. Potential Risks: Attackers may exploit this vulnerability to launch Cross-Site Scripting (XSS) attacks, SQL Injection, or other malicious operations, thereby obtaining sensitive information or executing unauthorized actions. Remediation 1. Update the Plugin: Users are advised to immediately update the CMB2 plugin to the latest version to obtain the most recent security patches. 2. Code Review: Conduct a code review of the file to ensure that all user inputs undergo appropriate validation and sanitization. 3. Input Validation: Implement strict input validation rules when receiving user input to ensure data conforms to the expected format. 4. Output Encoding: Apply appropriate encoding methods when outputting user input data to prevent XSS attacks. POC Code ```php // Example POC Code if ( function_exists( 'apply_filters_deprecated' ) ) { $sanitized_value = apply_filters_deprecated( 'cmb2_validate_' . $field_type, array( null, $this->value, $this->field, $this->field->args(), $this ), '2.0.0', 'cmb2_sanitize_' . $field_type ); } else { $sanitized_value = apply_filters( 'cmb2_validate_' . $field_type, null, $this->value, $this->field, $this->field->args(), $this ); } if ( null !== $sanitized_value ) { return $sanitized_value; } $sanitized_value = ''; switch ( $field_type ) { case 'text': case 'text_small': case 'text_medium': case 'text_large': case 'text_url': case 'text_email': case 'text_money': case 'text_number': case 'text_percent': case 'text_date': case 'text_datetime': case 'text_datetime_timestamp': case 'text_time': case 'text_date_timestamp': case 'text_datetime_timestamp_timezone': case 'text_datetime_timestamp_timezone_string': case 'text_datetime_timestamp_timezone_string_tz': case 'text_datetime_timestamp_timezone_string_tz_offset': case 'text_datetime_timestamp_timezone_string_tz_offset_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst': case 'text_datetime_timestamp_timezone_string_tz_offset_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_dst_ds

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CMB2 Plugin 2.13.1 Input Validation Flaw Leading to XSS/SQLi

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