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

criticalknown exploitedpublic exploitCVE-2025-26399
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: SolarWindsproduct: Web Help DeskUnsafe deserializationRemote code execution
What
The vulnerability allows an attacker to run commands on the host machine through deserialization of untrusted data.
Who is affected
Deployments of SolarWinds Web Help Desk are affected by this vulnerability.
Urgency
Remediation is critical due to active exploitation and the severity of the vulnerability.
Action
Patch SolarWinds Web Help Desk to the latest version to address this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-03-09
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-26399

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-26399coverage & exploitation statusNVD · CVE.org

Recent advisories for SolarWinds Web Help

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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