CVE-2025-26399SolarWindsServers and softwareMarch 9, 2026

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Critical 9.8Actively exploitedUsed by ransomware

Description

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.

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Details

Vendor
SolarWinds
Product
SolarWinds Web Help Desk
CVE
CVE-2025-26399
Affected versions
Web Help Desk 12.8: up to 12.8.7 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
9.8
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
March 12, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
March 9, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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