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CVE-2026-10833: Gutenberg Essential Blocks - Page Builder for Gutenberg Blocks & Patterns <= 6.1.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'configurablePrefix' Block Attribute

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-06-25
• Weakness: CWE-79

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.

Affected products

• wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns: through 6.1.4

References

• https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.1.4/includes/Blocks/TableOfContents.php#L245
• https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.1.4/includes/Blocks/TableOfContents.php#L425
• https://plugins.trac.wordpress.org/browser/essential-blocks/tags/6.1.4/src/blocks/table-of-contents/src/frontend.js#L448
• https://www.wordfence.com/threat-intel/vulnerabilities/id/0efe8bbd-c1c9-48ed-adab-34c0ac3da8bf?source=cve

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