Stored Cross-Site Scripting in Essential Blocks for WordPress
CVE-2026-4658

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Gutenberg Essential Blocks – Page Builder For Gutenberg Blocks & Patterns
Vendor
CVE Published:
2 May 2026

What is CVE-2026-4658?

The Essential Blocks plugin for WordPress is susceptible to Stored Cross-Site Scripting. This vulnerability arises from insufficient output escaping in the Add to Cart block's attributes (className, classHook, and blockId). When utilized, these attributes may permit authenticated attackers with Contributor-level access and above to inject arbitrary scripts into web pages. Consequently, these scripts will execute whenever users access the compromised pages, compromising their security and data integrity.

Affected Version(s)

Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns 0 <= 6.0.4

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/essential-bloc...
https://plugins.trac.wordpress.org/browser/essential-bloc...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jack Pas
darkestmode
.