QuantumCloud Highlight versions up to 2.0.2 suffer from a stored cross-site scripting vulnerability due to improper input neutralization during web page generation. This allows an attacker with high privileges to inject malicious scripts that are stored and later executed when other users view the affected content. The vulnerability has a CVSS 3.1 base score of 5.9, reflecting medium severity with network attack vector, low attack complexity, required privileges, and user interaction. The impact includes limited confidentiality, integrity, and availability loss. No patch or official remediation guidance is currently available, and no exploits are known in the wild.

Successful exploitation could allow an attacker with high privileges to inject malicious scripts that execute in the context of other users, potentially leading to limited disclosure of information, modification of data, or disruption of service. The impact is rated as medium severity with partial loss of confidentiality, integrity, and availability.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict high-privilege user access and carefully validate and sanitize inputs to mitigate stored XSS risks. Monitor for suspicious activity related to script injection attempts.