Reported vulnerability

Bread & Butter: Content Gating for Verified Leads <= 8.6.0.107 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Q: Which versions of Bread & Butter – Identify Website Visitors, Score Leads & Gate Content are affected?

Wordfence lists these affected versions: Start version unspecified, through 8.6.0.107. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for Bread & Butter – Identify Website Visitors, Score Leads & Gate Content?

Wordfence reports a fix for this issue in Bread & Butter – Identify Website Visitors, Score Leads & Gate Content. It lists these fixed versions: 8.7.0.139. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 21 Apr 2026

Updated 10 Jul 2026

CVE-2026-4279

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 6.4

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.

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

Bread & Butter – Identify Website Visitors, Score Leads & Gate Content

Software: plugin · bread-butter
Affected versions: Start version unspecified, through 8.6.0.107
Fix availability: Fix available
Fixed versions: 8.7.0.139

Recommended action

Update to version 8.7.0.139, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/0728b42b-5ec7-46a2-a9a5-3316107e9324?source=api-prod

Data sources and licences

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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 licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of Bread & Butter – Identify Website Visitors, Score Leads & Gate Content are affected?

Wordfence lists these affected versions: Start version unspecified, through 8.6.0.107. Use the version checker above to compare your installed release with this report.

Is a fix available for Bread & Butter – Identify Website Visitors, Score Leads & Gate Content?

Wordfence reports a fix for this issue in Bread & Butter – Identify Website Visitors, Score Leads & Gate Content. It lists these fixed versions: 8.7.0.139. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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