{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-4279", "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "state": "PUBLISHED", "assignerShortName": "Wordfence", "dateReserved": "2026-03-16T15:41:42.321Z", "datePublished": "2026-04-22T07:45:29.930Z", "dateUpdated": "2026-04-22T07:45:29.930Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "shortName": "Wordfence", "dateUpdated": "2026-04-22T07:45:29.930Z"}, "affected": [{"vendor": "breadbutter", "product": "Bread & Butter: AI-Powered Lead Intelligence", "versions": [{"version": "0", "status": "affected", "lessThanOrEqual": "8.2.0.25", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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."}], "title": "Bread & Butter: Content Gating for Verified Leads <= 8.2.0.25 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes", "references": [{"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/0728b42b-5ec7-46a2-a9a5-3316107e9324?source=cve"}, {"url": "https://plugins.trac.wordpress.org/browser/bread-butter/trunk/src/Base/Shortcode.php#L380"}, {"url": "https://plugins.trac.wordpress.org/browser/bread-butter/tags/8.2.0.25/src/Base/Shortcode.php#L380"}, {"url": "https://plugins.trac.wordpress.org/browser/bread-butter/trunk/src/Base/Shortcode.php#L364"}, {"url": "https://plugins.trac.wordpress.org/browser/bread-butter/tags/8.2.0.25/src/Base/Shortcode.php#L364"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "cweId": "CWE-79", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM"}}], "credits": [{"lang": "en", "type": "finder", "value": "Athiwat Tiprasaharn"}], "timeline": [{"time": "2026-04-21T19:07:06.000Z", "lang": "en", "value": "Disclosed"}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-4279", "lastModified": "2026-04-22T09:16:25.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 2.7, "source": "security@wordfence.com", "type": "Primary"}]}, "published": "2026-04-22T09:16:25.160", "references": [{"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/bread-butter/tags/8.2.0.25/src/Base/Shortcode.php#L364"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/bread-butter/tags/8.2.0.25/src/Base/Shortcode.php#L380"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/bread-butter/trunk/src/Base/Shortcode.php#L364"}, {"source": "security@wordfence.com", "url": "https://plugins.trac.wordpress.org/browser/bread-butter/trunk/src/Base/Shortcode.php#L380"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/0728b42b-5ec7-46a2-a9a5-3316107e9324?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security@wordfence.com", "type": "Primary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-22T09:39:44.938370+00:00", "value": {"mitigation_remediation": ["Upgrade the Bread & Butter plugin to a version that includes the fix (any release newer than 8.2.0.25).", "Configure role\u2011permission settings to remove Contributor or higher privileges from users who should not be able to insert the affected shortcode.", "Remove or sanitize any existing pages or posts containing the insecure button shortcode to eliminate stored payloads."], "summary": {"action": "Patch Immediately", "impact": "Stored Cross\u2011Site Scripting (XSS) via the Bread & Butter shortcode"}, "threat_synthesis": {"affected_systems": "All editions of the Bread & Butter WordPress plugin from original release through and including version 8.2.0.25 are affected. The flaw can be exercised on any WordPress installation that has the plugin installed and an authenticated user with Contributor or higher privileges. Only the authenticated user can inject the payload; reflected or unauthenticated attacks are not supported by the current code.", "description_and_impact": "Stored Cross\u2011Site Scripting (XSS) occurs when the 'breadbutter-customevent-button' shortcode accepts an 'event' attribute that is not sanitized. The value is inserted directly into an onclick attribute of a JavaScript string without escaping. A compromised value allows an authenticated contributor\u2011level user to inject malicious JavaScript that runs when any page visitor clicks the button. The CWE for this flaw is 79.", "risk_and_exploitability": "The CVSS base score of 6.4 indicates a moderate severity vulnerability, and the EPSS score is not available. The exploit requires the attacker to log in as a Contributor or higher, and it targets the web application layer rather than the network. Because the payload is stored in a page and triggers upon a button click, an attacker can potentially steal session cookies, deface content, or perform other malicious actions. The vulnerability is listed in no CISA KEV catalog, but the moderate CVSS and the requirement for authenticated access still make it a notable security concern for site administrators."}}}}, "created": "2026-04-22T09:45:13.084148+00:00", "updated": "2026-04-22T09:45:13.084164+00:00", "vendors": []}