GutenKit <= 2.5.0 - Authenticated (Contributor+) Arbitrary CSS Injection
The GutenKit plugin for WordPress is vulnerable to CSS Injection in all versions up to, and including, 2.5.0. This is due to missing capability check on the saving user before persisting CSS style settings to post meta and block attributes, and missing trust validation before rendering those settings as an inline stylesheet. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary CSS into pages served to site visitors, enabling defacement, interface redressing, and forcing external resource loads.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor | <= 2.5.0 | 2.5.1 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-74- Platform
- WordPress
- Package
GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor- Disclosed
- 01.09.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 348034d7-49e9-4db5-9707-7b55a83ba50d - Wordfence Intelligence
Copyright 1999-2026 The MITRE Corporation
Copyright 2012-2026 Defiant Inc.
This record contains material that is subject to copyright
Copyright 1999-2026 The MITRE Corporation
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Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.
https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc. Copyright Defiant, Inc. All rights reserved except as granted below. License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026): Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy. Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Vulnerability history: GutenKit – Page Builder Blocks, Patterns, and Templates for Gutenberg Block Editor
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 10.2024 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- Medium 7
Disclosures per year
- 2024: 1
- 2025: 2
- 2026: 5
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