Chaty Pro Plugin up to 3.5.5 on WordPress class-admin-base.php fetch_custom_field widget_id sql injection

Summaryinfo

A vulnerability was found in Chaty Pro Plugin up to 3.5.5. It has been classified as critical. Affected by this vulnerability is the function fetch_custom_field of the file admin/class-admin-base.php. The manipulation of the argument widget_id leads to sql injection. This vulnerability is documented as CVE-2026-6251. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Chaty Pro Plugin up to 3.5.5 and classified as critical. This issue affects the function fetch_custom_field of the file admin/class-admin-base.php. The manipulation of the argument widget_id 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 Chaty Pro plugin for WordPress is vulnerable to Authenticated Time-Based Blind SQL Injection in versions up to and including 3.5.5. This is due to the fetch_custom_field() function in admin/class-admin-base.php retrieving the widget_id POST parameter via filter_input(INPUT_POST, ...) and directly concatenating the value into a raw SQL query in a numeric context without using $wpdb->prepare() or any integer casting. Additionally, the nonce verification check is performed after the SQL query has already executed, providing no protection against the injection. This makes it possible for authenticated attackers with subscriber-level access and above to inject arbitrary SQL commands, potentially leading to unauthorized extraction of sensitive database contents including user credentials and configuration data.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-6251 since 04/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. 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 07/28/2026). MITRE ATT&CK project uses the attack technique T1505 for this issue.

By approaching the search of inurl:admin/class-admin-base.php it is possible to find vulnerable targets with Google Hacking.

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

• Chaty

Name

• Pro Plugin

Version

• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5

CPE 2.3info

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CPE 2.2info

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

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