CVE-2021-39249

Name of the Vulnerable Software and Affected Versions Invision Community versions prior to 4.6.5.1

Description The issue allows reflected XSS because the filenames of uploaded files become predictable through a brute-force attack against the PHP mt rand function. This predictability can be exploited to conduct reflected XSS attacks.

Recommendations For versions prior to 4.6.5.1, update to version 4.6.5.1 or later to resolve the issue. As a temporary workaround, consider restricting file uploads until the update is applied.