CVE-2025-26399: Critical Unauthenticated RCE in SolarWinds Web Help Desk Through Second Bypass

On September 23, 2025, SolarWinds released a hotfix for a critical vulnerability impacting Web Help Desk (WHD), tracked as CVE-2025-26399. The vulnerability arises from a deserialization flaw in the AjaxProxy component that could allow a remote unauthenticated threat actor to achieve remote code execution. CVE-2025-26399 is the second bypass of a flaw originally disclosed last … CVE-2025-26399: Critical Unauthenticated RCE in SolarWinds Web Help Desk Through Second Bypass