The vulnerability CVE-2025-30539 in BMo Expo is a stored cross-site scripting issue caused by improper input neutralization during web page generation. This allows attackers with certain privileges to inject malicious scripts that persist and execute in the context of other users. The affected versions include all releases up to 1.0.15. The CVSS score of 5.9 indicates a medium severity with network attack vector, low attack complexity, required privileges, user interaction, and impacts on confidentiality, integrity, and availability. No patch or vendor advisory is currently available to confirm remediation status.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of other users, potentially leading to information disclosure, modification of data, or disruption of service. The CVSS vector indicates that the attack requires privileges and user interaction, and it affects confidentiality, integrity, and availability to a limited extent. There are no known active exploits reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should apply strict input validation and output encoding as a temporary mitigation. Monitor for updates from the vendor Benedikt Mo regarding patches or official workarounds.