CVE-2025-26399 - CVE House

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Status published Critical CVE-2025-26399

SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability

9.8 CVSS

Vulnerability Description

SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability is a patch bypass of CVE-2024-28988, which in turn is a patch bypass of CVE-2024-28986.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Anonymous working with Trend Micro Zero Day Initiative

References

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SolarWinds Web Help Desk Authentication Bypass Vulnerability

SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

SolarWinds Serv-U Path Restriction Bypass Vulnerability

Affected Vendor

SolarWinds

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Affected Software

Web Help Desk

Vulnerable Versions:

12.8.7 and below

Timeline

Official Publish: September 23rd, 2025

Last Modified: March 10th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1059 Command and Scripting Interpreter

T1505.003 Web Shell

T1105 Ingress Tool Transfer

Command and Control

T1068 Exploitation for Privilege Escalation

Privilege Escalation