Backport of [Security] Close cross scripting vulnerability into release/1.19.x

[dhiaayachi]

Backport

This PR is auto-generated from hashicorp#21342 to be assessed for backporting due to the inclusion of the label backport/1.19.

The below text is copied from the body of the original PR.

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Description

Sanitizes the user input before returning it using %v instead of directly concatenating the string

Testing & Reproduction steps

Links

https://github.com/hashicorp/consul-enterprise/security/code-scanning/17

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

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Overview of commits

• c8cb334 - 262efd8