WordPress security changelog
MEDIUM CVE-2026-12399 Deferred

Gutenverse – WordPress Blocks, Page Builder & Site Editor: Cross-site scripting

Gutenverse – WordPress Blocks, Page Builder & Site Editor is affected by cross-site scripting. Exploitation requires an authenticated WordPress account. Injected script can execute in the affected site's origin when the vulnerable output is viewed. The published affected range is <= 3.8.0.

CVE / CNA score 4.4 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Gutenverse – WordPress Blocks, Page Builder & Site Editor
Plugin slug
gutenverse
Affected
<= 3.8.0
Safe version
> 3.8.0
Published
Jun 27, 2026
Weakness
CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Jun 27, 2026 and is one of 9 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Gutenverse – WordPress Blocks, Page Builder & Site Editor to a release after 3.8.0, or disable and remove it until a fixed version is available.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

References

Primary and upstream sources