CVE-2021-39249: Invisioncommunity Invision Power Board

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows reflected XSS because the filenames of uploaded files become predictable through a brute-force attack against the PHP mt_rand function.

Affected products

• Invisioncommunity Invision Power Board: before 4.6.5.1 (fixed in 4.6.5.1)

Published 2021-08-17. Last modified 2026-06-17.