WordPress security changelog
MEDIUM CVE-2026-15333 Deferred

Cozy Blocks custom-font attributes permit stored XSS

Cozy Blocks through 2.2.11 lets a Contributor store an attacker-controlled cozyCustomFont block attribute. append_cozy_custom_font_data_attributes() inserts that value into inline font-family CSS and a Google Fonts link href while filtering rendered core and Cozy blocks, without first constraining or contextually escaping it. The resulting stored payload executes whenever the affected block is rendered.

CVE / CNA score 6.4 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Cozy Blocks – Page Builder for Gutenberg Editor & FSE with 600+ Patterns, 58 Blocks & Templates
Plugin slug
cozy-addons
Affected
<= 2.2.11
Safe version
2.2.12
Published
Jul 24, 2026
Weakness
CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Jul 24, 2026 and is one of 7 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Cozy Blocks to 2.2.12 or later. The fixed function allowlists letters, numbers, spaces, hyphens, underscores and apostrophes in cozyCustomFont, sanitizes the accepted value and escapes both the inline CSS and Google Fonts URL output. Review blocks carrying unexpected cozyCustomFont values.

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 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 'cozyCustomFont' 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.

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

References

Primary and upstream sources