The Marcel CL Simple Booking Widget versions up to 1.1 suffer from a CSRF vulnerability that enables stored XSS attacks. This means that an attacker can trick an authenticated user into submitting unauthorized requests that result in malicious scripts being stored and executed within the application context. The vulnerability is network exploitable without privileges but requires user interaction. The impact includes partial confidentiality, integrity, and availability loss as indicated by the CVSS vector. No patch or vendor advisory details are currently available.

Successful exploitation can lead to stored XSS, allowing attackers to execute malicious scripts in the context of the affected application, potentially compromising user data and session integrity. The CSRF aspect allows attackers to perform unauthorized actions by leveraging the victim's authenticated session. This can result in partial loss of confidentiality, integrity, and availability of the affected system or data.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling or limiting use of the affected Simple Booking Widget versions or implementing CSRF protections such as anti-CSRF tokens and input validation to mitigate risk.