CVE-2025-26399 CRITICAL

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

Vendor Solarwinds
Product Web Help Desk
Weakness CWE-502 · Unsafe deserialization
KEV Status Known Exploited
Published September 23, 2025
Last update March 10, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA 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.

Key dates

03Disclosure timeline

September 23, 2025 CVE published
March 10, 2026 Record updated