This vulnerability arises from improper neutralization of input (CWE-79) in Mautic 7.0.0's project selector component. Specifically, project names returned via AJAX are injected into the DOM as option fields without sanitization, enabling stored XSS attacks. An attacker with authenticated project creation rights can embed malicious JavaScript in project names. When other users with administrative privileges open entity editors that include the project selector, the injected script executes in their browser session, potentially compromising session integrity and data confidentiality. The CVSS 3.1 vector indicates network attack vector, low attack complexity, required privileges, user interaction, and partial impact on confidentiality and integrity.

Successful exploitation allows an attacker with limited privileges to execute arbitrary scripts in the context of administrative users' browsers. This can lead to session hijacking, unauthorized actions within the application, and exposure of sensitive organizational data accessible via the dashboard. The impact is limited to confidentiality and integrity with no direct availability impact. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict project creation permissions to trusted users only and consider monitoring for suspicious project names. Avoid opening entity editors containing the project selector with untrusted project data. Follow vendor updates closely for any forthcoming patches or mitigations.