trainingbusinesspros Groundhogg Plugin up to 4.5.14 on WordPress Legacy Contact Query Legacy_Contact_Query tag_query sql injection

Summaryinfo

A vulnerability was found in trainingbusinesspros Groundhogg Plugin up to 4.5.14. It has been declared as problematic. Affected is the function Legacy_Contact_Query of the component Legacy Contact Query. Such manipulation of the argument tag_query leads to sql injection. This vulnerability is listed as CVE-2026-18387. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in trainingbusinesspros Groundhogg Plugin up to 4.5.14. It has been rated as problematic. Affected by this issue is the function Legacy_Contact_Query of the component Legacy Contact Query. The manipulation of the argument tag_query with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to generic SQL Injection via the 'tag_query' parameter in all versions up to, and including, 4.5.14 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with vendor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. Exploitation requires the attacker to trigger the vulnerable Legacy_Contact_Query code path by submitting an unknown filter type (e.g. filters[0][0][type]=force_fallback), which causes a FilterException that dispatches execution away from the modern query handler.

The advisory is available at wordfence.com. This vulnerability is handled as CVE-2026-18387 since 07/30/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/15/2026). This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• trainingbusinesspros

Name

• Groundhogg Plugin

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 4.5.8
• 4.5.9
• 4.5.10
• 4.5.11
• 4.5.12
• 4.5.13
• 4.5.14

CPE 2.3info

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CPE 2.2info

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