CVE-2026-3516

MEDIUM WAF: High

CVSS 6.4 Published: 2026-03-21

CWE-79

The Contact List plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '_cl_map_iframe' parameter in all versions up to, and including, 3.0.18. This is due to insufficient input sanitization and output escaping when handling the Google Maps iframe custom field. The saveCustomFields() function in class-contact-list-custom-fields.php uses a regex to extract tags from user input but does not validate or sanitize the iframe's attributes, allowing event handlers like 'onload' to be included. The extracted iframe HTML is stored via update_post_meta() and later rendered on the front-end in class-cl-public-card.php without any escaping or wp_kses filtering. 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.</p> </div> <div class="space-y-6"> <div> <h2 class="text-xl font-semibold mb-3">WAF Coverage Analysis</h2> <div class="space-y-3"> <div class="rounded-lg border border-border bg-card p-4"> <div class="flex items-center justify-between mb-2"> <span class="font-medium">Cross-Site Scripting (XSS)</span> <span class="inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-semibold bg-green-500/10 text-green-500">High WAF Coverage</span> </div> <p class="text-sm text-muted-foreground mb-2">OWASP: A03:2021 Injection</p> <div class="flex flex-wrap gap-1"><span class="inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-semibold bg-blue-500/10 text-blue-500">941xxx - XSS / XXE</span> </div> </div></div> </div> <div><h2 class='text-xl font-semibold mb-3'>References</h2><ul class='divide-y divide-border'><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/browser/contact-list/tags/3.0.17/includes/class-contact-list-custom-fields.php#L675" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/browser/contact-list/tags/3.0.17/includes/class-contact-list-custom-fields.php#L697" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/browser/contact-list/tags/3.0.17/public/class-cl-public-card.php#L466" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/browser/contact-list/trunk/includes/class-contact-list-custom-fields.php#L675" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/browser/contact-list/trunk/includes/class-contact-list-custom-fields.php#L697" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/browser/contact-list/trunk/public/class-cl-public-card.php#L466" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://plugins.trac.wordpress.org/changeset/3486445" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">plugins.trac.wordpress.org</a></li><li class="py-2 border-b border-border last:border-0"><a href="https://www.wordfence.com/threat-intel/vulnerabilities/id/a8059995-55cb-49ee-add1-f5364d0772eb?source=cve" class="text-primary hover:underline text-sm" rel="noopener noreferrer" target="_blank">www.wordfence.com</a></li></ul></div> </div> <div class="mt-8 pt-4 border-t border-border text-sm text-muted-foreground"> <a href="/cve/" class="text-primary hover:underline">Back to CVE Database</a> </div> </main> </body> </html>