The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to price manipulation via the 'tips' parameter in all versions up to, and including, 27.0. This is due to the plugin trusting a user-supplied input without server-side validation against the configured price. This makes it possible for unauthenticated attackers to submit a negative number to the 'tips' parameter, causing the total price to be reduced to zero.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-bookin…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-bookin…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-bookin…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3480956/
security@wordfence.com
https://www.booking-wp-plugin.com/change-log/
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/ead87d8b-2659-4e8b-a0…
security@wordfence.com