Progress Telerik Report Server - Authentication Bypass (CVE-2024-4358)

CVE-2024-4358 is a high-severity vulnerability in Progress Telerik Report Server that allows unauthenticated attackers to bypass authentication and gain access to restricted functionality when the software is deployed on IIS.

CrowdSec has been tracking this vulnerability and its exploits since 10th of March 2025.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2024-4358 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. CrowdSec network telemetry also shows that exploitation of CVE-2024-4358 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Exploitation attempts often involve requests to endpoints such as /startup/register or /report/index.