CVE-2025-40551 CRITICAL

CVE-2025-40551: SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

Vendor Solarwinds
Product Web Help Desk
Weakness CWE-502 · Unsafe deserialization
KEV Status Known Exploited
Published January 28, 2026
Last update February 26, 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 untrusted data deserialization vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.

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

January 28, 2026 CVE published
February 26, 2026 Record updated