CVE-2026-34748: @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.
Other sources
Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/next, 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. This issue has been patched in version 3.78.0.
— MITRE