CVE-2026-15393
Received Received - Intake

Stored XSS in Cozy Blocks WordPress Plugin

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: Wordfence

Description
The Cozy Blocks – Page Builder for Gutenberg Editor & FSE with 600+ Patterns, 58 Blocks & Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'postMeta.font.size' Block Attribute in all versions up to, and including, 2.2.11 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.

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-15393
EUVD
EUVD-2026-49790

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
cozy_blocks page_builder to 2.2.11 (inc)
cozy_blocks page_builder_for_gutenberg_editor to 2.2.11 (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.

Attack-Flow Graph

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Cozy Blocks WordPress plugin. It allows authenticated attackers with contributor-level access or higher to inject malicious scripts into web pages via the 'postMeta.font.size' block attribute. The issue stems from insufficient input sanitization and output escaping.

Detection Guidance

This vulnerability requires checking WordPress installations for the Cozy Blocks plugin versions up to 2.2.11. Inspect plugin files for the 'postMeta.font.size' attribute in Gutenberg blocks. No specific commands are provided in the context.

Impact Analysis

An attacker could inject scripts that execute when users visit affected pages. This could lead to theft of cookies, session tokens, or other sensitive data. It may also allow attackers to perform actions on behalf of users or deface websites.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements. It may result in data breaches, triggering compliance obligations such as breach notifications and potential fines.

Mitigation Strategies

Update the Cozy Blocks plugin to the latest version beyond 2.2.11. If updating is not possible, consider disabling the plugin temporarily until a patch is applied. Remove any existing malicious scripts injected via the 'postMeta.font.size' attribute.

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