PT-2026-34299 · Breadbutter · Bread & Butter: Ai-Powered Lead Intelligence

Athiwat Tiprasaharn · Published 2026-04-22 · Updated 2026-04-22 · CVE-2026-4279

NVD

CVSS v3.1

6.4

Medium

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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, 8.2.0.25. 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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-4279

Affected Products

Bread & Butter: Ai-Powered Lead Intelligence

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-4279 · Security Note
• https://plugins.trac.wordpress.org/browser/bread-butter/trunk/src/Base/Shortcode.php#L380 · Note
• https://plugins.trac.wordpress.org/browser/bread-butter/tags/8.2.0.25/src/Base/Shortcode.php#L364 · Note
• https://plugins.trac.wordpress.org/browser/bread-butter/tags/8.2.0.25/src/Base/Shortcode.php#L380 · Note
• https://plugins.trac.wordpress.org/browser/bread-butter/trunk/src/Base/Shortcode.php#L364 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/0728b42b-5ec7-46a2-a9a5-3316107e9324?source=cve · Note