WordPress security changelog
MEDIUM CVE-2026-6675 Deferred

Responsive Blocks – Page Builder for Blocks & Patterns: A security weakness

Responsive Blocks – Page Builder for Blocks & Patterns is affected by a security weakness. The vulnerable path is reachable without authentication. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is <= 2.2.0.

CVE / CNA score 5.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Responsive Blocks – Page Builder for Blocks & Patterns
Plugin slug
responsive-block-editor-addons
Affected
<= 2.2.0
Safe version
> 2.2.0
Published
Apr 21, 2026
Weakness
CWE-20 — Improper Input Validation

This CVE was published Apr 21, 2026 and is one of 8 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Responsive Blocks – Page Builder for Blocks & Patterns to a release after 2.2.0, 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 Responsive Blocks – Page Builder for Blocks & Patterns plugin for WordPress is vulnerable to Unauthenticated Open Email Relay in all versions up to, and including, 2.2.0. This is due to insufficient authorization checks and missing server-side validation of the recipient email address supplied via a public REST API route. This makes it possible for unauthenticated attackers to send arbitrary emails to any recipient of their choosing through the affected WordPress site's mail server, effectively turning the site into an open mail relay.

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

References

Primary and upstream sources