---
id: "CVE-2025-26399"
kind: "vulnerability"
aliases: ["CVE-2025-26399"]
title: "SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "vendor"
products: [{"name": "SolarWinds Web Help Desk", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "solarwinds web help desk", "fixed": [], "affected": "<= 12.8.6", "ecosystem": "vendor"}, {"name": "solarwinds web help desk", "fixed": [], "affected": "= 12.8.7", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "ransomware", "self-hosted", "solarwinds", "vendor", "web-help-desk"]
not_affected_if: ["not-running-web-help-desk"]
published_at: "2025-09-23T05:15:35+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-26399", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26399", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code…

SolarWinds Web Help Desk has a deserialization flaw in its AjaxProxy component that accepts untrusted data. An attacker who can reach the service can run commands on the host machine.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:SolarWinds Web Help Desk affected ? fixed ?
- vendor:solarwinds web help desk affected <= 12.8.6 fixed ?
- vendor:solarwinds web help desk affected = 12.8.7 fixed ?

## Fix

Apply the vendor mitigations per SolarWinds instructions, or discontinue use of the product if mitigations are unavailable (per CISA KEV required action). Exact fixed version: unknown

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-26399
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-26399

## From the sources

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.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_