WordPress 403 issue when passing parameters in the URL

This error is generated by the Cerber Security Plugin. You can add an exception on ‘Antispam’ under the WP Cerber menu, ‘Adjust Antispam engine’, ‘Query whitelist’. You probably want

{\/contact-us\?enquiry_type=\d+}

for a regular expression to match any numeric enquiry_type value. The relevant documentation is here: Configuring exceptions for the antispam engine.

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