CVE-2026-10833
Received Received - Intake

Stored XSS in Gutenberg Essential Blocks WordPress Plugin

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: Wordfence

Description
The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'configurablePrefix' Block Attribute in all versions up to, and including, 6.1.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS Scores

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Meta Information

Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-07-15
AI Q&A
2026-06-25
EPSS Evaluated
2026-07-14
NVD
CVE-2026-10833
EUVD
EUVD-2026-39164

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gutenberg essential_blocks to 6.1.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability. This occurs via the 'configurablePrefix' Block Attribute in all versions up to and including 6.1.4. The vulnerability exists because of insufficient input sanitization and output escaping.

Authenticated attackers with Contributor-level access or higher can exploit this flaw to inject arbitrary web scripts into pages. These scripts will execute whenever any user accesses the injected page.

Impact Analysis

This vulnerability allows attackers with Contributor-level access or above to inject malicious scripts into pages. When other users visit these pages, the injected scripts execute in their browsers.

The impact includes potential theft of user data, session hijacking, defacement, or other malicious actions performed by the injected scripts. Since the vulnerability has a CVSS base score of 6.4 with low attack complexity and no user interaction required, it poses a significant risk to affected sites.

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