This vulnerability in regibaer Evangelische Termine (<= 3.3) involves improper neutralization of input during web page generation, leading to reflected Cross-site Scripting (XSS). An attacker can craft malicious input that is reflected in the web page output without proper sanitization, potentially executing arbitrary scripts in the context of the victim's browser. The CVSS 3.1 score of 7.1 reflects network-based attack with low complexity, requiring no privileges but some user interaction, and impacts confidentiality, integrity, and availability at a low to high level.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to information disclosure, session hijacking, or other client-side impacts. The vulnerability affects confidentiality, integrity, and availability to varying degrees as indicated by the CVSS vector. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider applying input validation and output encoding controls where possible to mitigate reflected XSS risks. Monitor vendor channels for updates and apply patches promptly once released.