{"id":"CVE-2026-19902","revision":"260b77ffb24f4a97ad88aeee70b186c7","records":[{"revision":"260b77ffb24f4a97ad88aeee70b186c7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-19902","aliases":[],"title":"Ad Inserter <= 2.8.18 - Reflected Cross-Site Scripting via {search-query} Dynamic Tag (Referer Header)","description":"The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the Referer header in all versions up to, and including, 2.8.18 due to insufficient input sanitization and output escaping on the '{search-query}' dynamic tag. When an ad block's code contains that tag, replace_ai_tags() reads $_SERVER['HTTP_REFERER'] and tests it with the regex /[\\.\\/](google|yahoo|bing|ask)\\.[a-z\\.]{2,5}[\\/]/i. The leading [\\.\\/] class matches a literal slash, so any referrer merely containing a segment such as '/google.com/' passes as a search-engine referral; the plugin then percent-decodes the referring query with parse_str() and substitutes the resulting 'q' (or 'p') value into the block via preg_replace() with no escaping. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of the site for any visitor, including a signed-in administrator, by luring them to an attacker-controlled page that frames or links to any ordinary post. Exploitation requires the site to have an ad block whose code uses the '{search-query}' tag with automatic insertion enabled — a documented plugin feature used as intended.","state":0,"publishedAt":"2026-10-01T07:40:23.197+00:00","modifiedAt":"2026-10-03T15:42:52.231+00:00","affected":[{"ecosystem":"Vendor product","name":"Ad Inserter – Ad Manager & AdSense Ads","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"spacetime\",\n                    \"product\": \"Ad Inserter – Ad Manager & AdSense Ads\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"2.8.18\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/5d632cce-40a9-4969-b213-8370ae75287e?source=cve","https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13093","https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13018","https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13022","https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13025","https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/class.php#L3297","https://plugins.trac.wordpress.org/changeset?reponame=&new=3709970%40ad-inserter%2Ftags%2F2.8.19&old=3624916%40ad-inserter%2Ftags%2F2.8.18","https://plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-19902","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-19902","identifiers":["CVE-2026-19902"]},"retained":false,"historicalAffected":[]}],"coverage":[]}