For SocialEngine 4.x specifically, there are known, documented vulnerabilities that attackers actively scan for. For example:
To understand the risk, you must first understand the terminology. nulled 118 plugins modules for social engine 4.x
Rogue scripts can quietly use your server resources to mine cryptocurrency, spiking your hosting bills and crashing your site. For SocialEngine 4
Instead of risking your community with pirated packs, consider these verified sources for SocialEngine 4.x modules: For SocialEngine 4.x specifically