CVE-2025-26399Known exploitationNetwork attack vector

Unauthenticated command execution via AjaxProxy deserialization

Published Sep 23, 2025 · Updated Sep 23, 2025

Deserialization in SolarWinds Web Help Desk 12.8.7 and earlier allows remote attackers to execute commands through AjaxProxy. AjaxProxy deserializes attacker-supplied data, but SolarWinds has not disclosed the affected method or the precise filtering gap. No authentication or user interaction is required, and successful exploitation runs arbitrary commands in the Web Help Desk application context.

CVSS severity9.8
Critical
EPSS probability89.50%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in SolarWinds Web Help Desk 12.8.7 and earlier allows remote attackers to execute commands through AjaxProxy. AjaxProxy deserializes attacker-supplied data, but SolarWinds has not disclosed the affected method or the precise filtering gap. No authentication or user interaction is required, and successful exploitation runs arbitrary commands in the Web Help Desk application context.

The record

CVE
CVE-2025-26399
Published
Sep 23, 2025
Updated
Sep 23, 2025
Vendor
SolarWinds
Product
Web Help Desk
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.8.7 and below

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SolarWinds · Web Help Deskversion=12.8.7 and below

Published CVSS scores

9.8SolarWindsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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