Attack Chain

1. The attacker identifies a WordPress site using a vulnerable version of the Geo Mashup plugin (<= 1.13.18) with the Geo Search feature enabled.
2. The attacker crafts a malicious HTTP POST request targeting the SearchResults hook with a specially crafted map_post_type parameter containing SQL injection payload.
3. The vulnerable code within the Geo Mashup plugin processes the POST request, removing magic quotes using stripslashes_deep($_POST).
4. The unsanitized map_post_type value is then concatenated directly into an SQL query within an IN(...) clause without proper escaping.
5. The injected SQL code executes within the database query, allowing the attacker to manipulate the query’s behavior.
6. The attacker uses time-based SQL injection techniques (e.g., IF(condition, SLEEP(5), 0)) within the injected payload to infer information based on the response time.
7. By repeatedly sending modified requests and observing the response times, the attacker can extract sensitive data, character by character, from the database.
8. The attacker extracts sensitive information such as usernames, passwords, API keys, or other confidential data stored in the WordPress database.

Impact

Successful exploitation of this vulnerability allows unauthenticated attackers to extract sensitive information from the WordPress database. The severity of the impact depends on the sensitivity of the data stored in the database, but could include exposure of user credentials, confidential business data, or other sensitive information. Because it affects any installation with the Geo Search feature enabled, a large number of websites using the Geo Mashup plugin may be vulnerable. The CVSS v3.1 base score is 7.5, indicating a high severity vulnerability.

Recommendation

• Upgrade the Geo Mashup plugin to the latest version (later than 1.13.18) to patch CVE-2026-4061.
• Deploy the provided Sigma rule to detect potential exploitation attempts targeting the vulnerable SearchResults hook using a malicious map_post_type parameter.
• Review web server logs for suspicious POST requests to /wp-admin/admin-ajax.php (common AJAX endpoint in WordPress) containing potentially malicious SQL injection payloads in the map_post_type parameter.