CVE-2026-19698
Received Received - Intake

GutenKit Plugin CSS Injection Vulnerability

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: WPScan

Description
The GutenKit WordPress plugin before 2.5.1 does not validate or escape style settings saved against a post before using them to build the CSS it outputs on the front end, allowing users with the Contributor role and above to inject arbitrary CSS into pages served to other users and to anonymous visitors. JavaScript execution is not possible at that role, so the impact is limited to defacement, interface redressing and forcing external resources to load.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-19698
EUVD
EUVD-2026-70036

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gutenkit gutenkit to 2.5.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

This vulnerability is a stored CSS injection issue in the GutenKit WordPress plugin before version 2.5.1. Users with Contributor role or higher can inject arbitrary CSS into posts. The plugin fails to validate or escape style settings, allowing these injections to affect all visitors. While JavaScript execution isn't possible, it enables defacement, interface manipulation, and loading external resources.

Detection Guidance

To detect this vulnerability, check the installed version of the GutenKit WordPress plugin. If the version is below 2.5.1, the system is vulnerable. You can verify the plugin version by inspecting the plugin files or using WordPress admin tools.

Impact Analysis

The impact includes page defacement, interface redressing, and forcing external resources to load for all users visiting affected pages. Attackers could alter the appearance of pages, trick users into interacting with fake elements, or load malicious content. Visitors may experience unexpected behavior or visual changes on the site.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized CSS injection that may alter the appearance of web pages or load external resources. Such changes might interfere with required user interface elements or data presentation, potentially violating integrity or confidentiality requirements under these regulations.

Mitigation Strategies

Immediately update the GutenKit plugin to version 2.5.1 or later to patch the vulnerability. If updating is not possible, consider disabling the plugin temporarily until an update can be applied.

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