[1.0.x] Taxonomy Term Replace

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Please read Review process for security advisory coverage: What to expect → for more details and Security advisory coverage application checklist → to understand what reviewers look for. Tips for ensuring a smooth review → gives some hints for a smoother review.

The important notes are the following.

• If you have not done it yet, you should run phpcs --standard=Drupal,DrupalPractice on the project, which alone fixes most of what reviewers would report.
• For the time this application is open, only your commits are allowed.
• The purpose of this application is giving you a new drupal.org role that allows you to opt projects into security advisory coverage, either projects you already created, or projects you will create. The project status won't be changed by this application and no other user will be able to opt projects into security advisory policy.
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To the reviewers

Please read How to review security advisory coverage applications → , Application workflow → , What to cover in an application review → , and Tools to use for reviews → .

The important notes are the following.

• It is preferable to wait for a Code Review Administrator before commenting on newly created applications. Code Review Administrators will do some preliminary checks that are necessary before any change on the project files is suggested.
• Reviewers should show the output of a CLI tool → only once per application.
• It may be best to have the applicant fix things before further review.

For new reviewers, I would also suggest to first read In which way the issue queue for coverage applications is different from other project queues → .

I am changing priority as per Issue priorities → .

• The following points are just a start and don't necessarily encompass all of the changes that may be necessary
• A specific point may just be an example and may apply in other places
• A review is about code that doesn't follow the coding standards, contains possible security issue, or doesn't correctly use the Drupal API; the single points aren't ordered, not even by importance

src/Form/TaxonomyTermConfirmationForm.php & TaxonomyTermReplaceForm.php

    $target_term_id = base64_decode($request->query->get('target_term_id'));
    $replacement_term_id = base64_decode($request->query->get('replacement_term_id'));
    $total_nodes = base64_decode($request->query->get('total_nodes'));
    $target_term = base64_decode($request->query->get('target_term'));
    $replacement_term = base64_decode($request->query->get('replacement_term'));

sanitize user inputted text