The vulnerability CVE-2025-49450 in mhallmann SEPA Girocode (versions <= 0.5.1) is a stored cross-site scripting (XSS) issue caused by improper input neutralization during web page generation. This allows attackers with limited privileges and requiring user interaction to inject malicious scripts that can execute in the context of other users, potentially impacting confidentiality, integrity, and availability to a limited extent. The CVSS vector indicates network attack vector, low attack complexity, requiring privileges and user interaction, with scope changed and low impact on confidentiality, integrity, and availability.

Successful exploitation of this stored XSS vulnerability could allow an attacker to execute arbitrary scripts in the context of affected users, potentially leading to information disclosure, session hijacking, or other client-side impacts. The CVSS score of 6.5 reflects a medium severity with limited but non-negligible impact on confidentiality, integrity, and availability. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor the vendor's communications for updates. In the meantime, restricting privileges and limiting user interaction with untrusted content may reduce risk.