SolarWinds Web Help Desk Deserialization Vulnerability Enables Command Execution

The SolarWinds Web Help Desk has a problem with deserialization This article explores solarwinds vulnerability ajaxproxy. . Cybersecurity experts have found a serious security hole in SolarWinds Web Help Desk that system administrators need to fix right away.

This flaw, known as CVE-2025-26399, lets bad people run commands on the host machine without permission. The Cybersecurity and Infrastructure Security Agency (CISA) has officially added this flaw to its Known Exploited Vulnerabilities catalog because it is so serious and is being actively used. The main issue is a security hole called "deserialization of untrusted data," which is part of CWE-502. The AjaxProxy part of SolarWinds Web Help Desk has this particular flaw.

Deserialization in SolarWinds Web Help Desk is a normal computing process in which software unpacks formatted data into active objects that the system can read and use. But a major security hole happens when a system unpacks data from an untrusted or outside source without doing the right safety checks. Because of this SolarWinds vulnerability, the AjaxProxy component doesn't check incoming data packets well enough before processing them.

Threat actors can trick the application into running harmful instructions directly in the system's memory by sending carefully crafted malicious payloads. After the bad data is processed, the attacker can run any command they want on the host that was affected.

This level of access is very dangerous because it gives the attacker direct control over the server that runs the help desk software. After that, a hacker could steal sensitive company information, change user accounts, or move deeper into the company's internal network. Researchers in the field of security say that it is still unclear if ransomware gangs are using this particular flaw in their extortion campaigns right now.

But CISA's warning shows that threat actors are using the flaw in real-world attacks. Companies that have exposed versions of SolarWinds Web Help Desk are very likely to be hacked right away. CISA Requires Action Right Away Federal agencies and operators of critical infrastructure have very little time to protect their networks.

On March 9, 2026, CISA added CVE-2025-26399 to its list of things to do. According to Binding Operational Directive (BOD) 22-01, federal civilian executive branch agencies have until March 12, 2026, to fix this problem. This order is aimed at government agencies, but private companies are strongly encouraged to treat this deadline with the same level of urgency.

Security teams need to act right away to keep their environments safe from being hacked. The following steps are suggested by CISA and security experts: To fix the AjaxProxy component, you need to install the most recent security updates from SolarWinds right away. Follow the BOD 22-01 rules that apply to you, especially when it comes to the security of related cloud services. If you can't apply patches, stop using the product completely and unplug it from the network.

Check network logs for strange command execution, unexpected administrative access, or traffic going out that isn't normal. LinkedIn and X for daily updates on cybersecurity. Get in touch with us if you want to share your stories.