CVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Added to the CISA Known Exploited Vulnerabilities catalog on 09 Mar 2026. Vendor: SolarWinds. Product: Web Help Desk.

SolarWinds Web Help Desk contain a deserialization of untrusted data vulnerability in AjaxProxy that could allow an attacker to run commands on the host machine.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. (due 12 Mar 2026)