@payloadcms/next has Stored XSS in Admin Panel

Impact

A stored Cross-site Scripting (XSS) vulnerability existed in the admin panel. An authenticated user with write access to a collection could save content that, when viewed by another user, would execute in their browser.

Consumers are affected if ALL of these are true:

• Payload version < v3.78.0
• At least one collection with versions enabled
• An authenticated user has create or update access to that collection

Patches

This vulnerability has been patched in v3.78.0. Output encoding has been added to prevent user-supplied content from being interpreted as markup.

Users should upgrade to v3.78.0 or later.

Workarounds

If consumers cannot upgrade immediately:

• Restrict create and update access to versioned collections to trusted roles only.