Bread & Butter: Content Gating for Verified Leads <= 8.6.0.107 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
| CVE | CVE-2026-4279 |
|---|---|
| CVSS | 6.4 (Medium) |
| Publicly Published | April 21, 2026 |
| Last Updated | July 10, 2026 |
| Researcher |
Athiwat Tiprasaharn (Jitlada)
|
Description
The Bread & Butter plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'breadbutter-customevent-button' shortcode in all versions up to, and including, 8.6.0.107. This is due to insufficient input sanitization and output escaping on the 'event' shortcode attribute. The customEventShortCodeButton() function takes the 'event' attribute value and directly interpolates it into a JavaScript string within an onclick HTML attribute without applying esc_attr() or esc_js(). Notably, the sister function customEventShortCode() properly uses esc_js() for the same attribute, but this was omitted in the button variant. 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 the page and clicks the injected button.
Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
Share
Vulnerability Details for Bread & Butter – Identify Website Visitors, Score Leads & Gate Content
| Software Type | Plugin |
|---|---|
| Software Slug | bread-butter (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 8.7.0.139, or a newer patched version |
| Affected Version |
|
| Patched Version |
|
Recent vulnerabilities in Bread & Butter – Identify Website Visitors, Score Leads & Gate Content
This record contains material that is subject to copyright.
Copyright 2012-2026 Defiant Inc.
License: 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. Read more.
Copyright 1999-2026 The MITRE Corporation
License: CVE Usage: MITRE 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 Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy. Read more.
Have information to add, or spot any errors? Contact us at wfi-support@wordfence.com so we can make any appropriate adjustments.
Did you know Wordfence Intelligence provides free personal and commercial API access to our comprehensive WordPress vulnerability database, along with a free webhook integration to stay on top of the latest vulnerabilities added and updated in the database? Get started today!
Learn moreWant to get notified of the latest vulnerabilities that may affect your WordPress site?
Install Wordfence on your site today to get notified immediately if your site is affected by a vulnerability that has been added to our database.
The Wordfence Intelligence WordPress vulnerability database is completely free to access and query via API. Please review the documentation on how to access and consume the vulnerability data via API.
Documentation