SolarWinds · Web Help Desk
CVE-2025-26399
SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability
What it is
SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability is a patch bypass of CVE-2024-28988, which in turn is a patch bypass of CVE-2024-28986.
CISA: 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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: March 12, 2026
More exploited flaws from SolarWinds
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Feb 12, 2026 | Security Control Bypass | Web Help Desk | High 8.1 | 74% |
| Feb 3, 2026 | Deserialization of Untrusted Data | Web Help Desk | Critical 9.8 | 84% |
| Oct 15, 2024 | Hardcoded Credential | Web Help Desk | Critical 9.1 | 93% |
| Aug 15, 2024 | Deserialization of Untrusted Data | Web Help Desk | Critical 9.8 | 85% |
| Jun 5, 2026 | Uncontrolled Resource Consumption | Serv-U | High 7.5 | 44% |
| Jul 17, 2024 | Path Traversal Vulnerability | Serv-U | High 8.6 | 99.6% |
| Jan 21, 2022 | Improper Input Validation | Serv-U | Medium 4.3 | 3.5% |
| Nov 3, 2021 | Privilege Escalation | Virtualization Manager | High 7.8 | 3.7% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.