Invisible Unicode tag characters create a new security risk for AI-powered applications by hiding malicious instructions inside seemingly harmless prompts. Because some large language models still interpret these invisible characters as valid text, attackers can use them to manipulate responses or inject harmful commands without user awareness. These characters occupy a unique Unicode block and produce predictable UTF-8 byte patterns, making them detectable at the network layer. By adding a custom WAF rule, the Progress Kemp LoadMaster can identify and block requests containing invisible tag characters, helping protect AI applications from prompt injection and other emerging threats.

One novel type of attack involves invisible letters—once a tool of espionage with invisible ink, this is now a modern-day threat to AI prompts.

After F5’s 2025 breach, IT leaders are turning to Progress Kemp LoadMaster platform for secure, simple and transparent load balancing with lower TCO.

The internet is a dangerous place, with many bad actors using automated tools to attack organizations of all sizes, 24 hours a day, seven days a week. Regardless of your …

Explore how Progress Kemp LoadMaster-based Global Server Load Balancing shifts disaster recovery from reactive to proactive—highlighted in our recent webinar.

Learn how to protect your SharePoint environment from the critical CVE-2025-53770 vulnerability using Progress Kemp LoadMaster Web Application Firewall (WAF). Discover step-by-step guidance for applying a virtual patch, blocking exploit attempts and enhancing your web app security—even if you can’t immediately update SharePoint.

Learn how to deploy Progress Kemp LoadMaster on Proxmox VE with this guide outlining key steps and insights.

Following on from our high ratings in the last few G2 Grid® Reports for Load Balancing, we’re pleased to report that the Progress Kemp LoadMaster solution has maintained or increased its ranking position in the G2 Grid® Report for Load Balancing for Summer 2025.

The most effective defensive approach for websites and web applications is to use multiple, independent layers of defense. And a Web Application Firewall can provide that defense.