matthiasnordwig Invisible Anti-Spam & CAPTCHA Plugin up to 5.1 on WordPress key sql injection

Summaryinfo

A vulnerability identified as problematic has been detected in matthiasnordwig Invisible Anti-Spam & CAPTCHA Plugin up to 5.1. This affects an unknown part. The manipulation of the argument key leads to sql injection. This vulnerability is documented as CVE-2026-16094. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in matthiasnordwig Invisible Anti-Spam & CAPTCHA Plugin up to 5.1. This issue affects some unknown functionality. The manipulation of the argument key 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. The summary by CVE is:

The Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms plugin for WordPress is vulnerable to generic SQL Injection via the 'key' parameter in all versions up to, and including, 5.1 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 editor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-16094 since 07/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026). MITRE ATT&CK project uses the attack technique T1505 for this issue.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• matthiasnordwig

Name

• Invisible Anti-Spam & CAPTCHA Plugin

Version

• 5.0
• 5.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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