CVE-2025-40553: SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 68.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-28 · updated 2026-06-17
Weakness: CWE-502

Description

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.

Affected products

SolarWinds Web Help Desk: before 2026.1 — fixed in 2026.1

How to fix

Upgrade to a fixed version: SolarWinds Web Help Desk 2026.1. Check the vendor advisory for mitigations.

References

https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm
https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40553
https://github.com/watchtowrlabs/watchTowr-vs-SolarWinds-WebHelpDesk-CVE-2025-40552-CVE-2025-40553/blob/main/watchTowr-vs-SolarWinds-WebHelpDesk-CVE-2025-40552-CVE-2025-40553.py

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