Craft CMS has an authorization bypass which allows any control panel user to move entries without permissions

Summary

An authenticated control panel user with only accessCp can move entries across sections via POST /actions/entries/move-to-section, even when they do not have saveEntries:{sectionUid} permission for either source or destination section.

Details

Root-cause analysis

1. actionMoveToSection accepts sectionId and entryIds, loads entries, and iterates: Craft::$app->getEntries()->moveEntryToSection($entry, $section).
2. The endpoint does not enforce per-entry or per-section authorization checks.
3. moveEntryToSection() also does not enforce current-user authorization.
4. There is a permission check in actionMoveToSectionModalData for building UI options, but that check is not enforced in the actual endpoint.
5. Therefore, a direct POST request can bypass UI filtering and perform unauthorized entry moves.

Impact

• This is an authorization bypass permitting unauthorized content changes.
• Authenticated low-privileged control panel users can move entries they should not be able to manage, violating integrity and potentially disrupting routing/editorial controls.