ACTIVELY EXPLOITED
CVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
| Vendor | SolarWinds |
|---|---|
| Product | Web Help Desk |
| Actively exploited | Yes |
| Added to CISA KEV | 9 Mar 2026 |
| CISA federal deadline | 12 Mar 2026 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-502 |
Required action (CISA's text)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description (NVD)
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.
SOURCES
Other SolarWinds flaws
- CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
- CVE-2025-40536: SolarWinds Web Help Desk Security Control Bypass Vulnerability
- CVE-2025-40551: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
- CVE-2024-28987: SolarWinds Web Help Desk Hardcoded Credential Vulnerability
- CVE-2024-28986: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.