<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves
https://github.com/fleetdm/confidential/issues/16880
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Summary by CodeRabbit
* **Bug Fixes**
* Secured the Windows MDM Terms of Service endpoint against reflected
cross-site scripting.
* Strengthened validation for the `redirect_uri` used in Terms of
Service rendering, allowing only approved `https` and `ms-appx-web`
schemes.
* Unsafe, malformed, or non-allowlisted redirect values are now rejected
and not displayed.
* **Tests**
* Added integration and unit coverage to verify unsafe redirects are
blocked while valid ones continue to work.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Sharon Katz <121527325+sharon-fdm@users.noreply.github.com>
