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CVE-2025-40553

CriticalPublished

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

Published: Jan 28, 2026
Updated: Feb 27, 2026
Assigning CNA: SolarWinds
Evidence observed: Aug 17, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

60.4%

High · next 30 days

Percentile: 99.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

watchTowr-vs-SolarWinds-WebHelpDesk-CVE-2025-40552-CVE-2025-40553Detection
Detection artifact generator for SolarWinds Web Help Desk pre-auth RCE chain (CVE-2025-40552 + CVE-2025-40553). Verifies authentication bypass and remote code execution via SQL query execution.

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