The nd-booking plugin before 2.5 for WordPress has a nopriv_ AJAX action that allows modification of the siteurl setting.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

• ND Booking < 2.5 - Unauthenticated Options Change http/cves/2019/CVE-2019-15774.yaml

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.