This indicates an attack attempt to exploit a Cross-Site Scripting vulnerability in Atmosphere Framework.
The vulnerability is due to insufficient sanitizing of user-supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary script code within the context of the application.
Atmosphere Framework 2.4.0 - 2.4.28
Atmosphere Framework 2.3.0 - 2.3.9
Atmosphere Framework 2.2.0 - 2.2.12
Atmosphere Framework 2.1.0 - 2.1.13
Atmosphere Framework 2.0.0 - 2.0.11
Atmosphere Framework 1.0.0 - 1.0.20
System Compromise: Remote attackers can execute arbitrary script code in the context of the affected system.
Apply the most recent upgrade or patch from the vendor.