CVE-2026-34748
@payloadcms/next has Stored XSS in Admin Panel
Description
### 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.
How to fix CVE-2026-34748
To remediate CVE-2026-34748, upgrade the affected package to a fixed version below.
- —upgrade to 3.78.0 or later
Is CVE-2026-34748 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 3.78.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |