Vulnerability · Published Jan 28, 2026 · Assigned by SolarWinds
CVE-2025-40553SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity unsafe deserialization in Web Help Desk from SolarWinds. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 68.0% (higher than 99.3% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)68.0%top 0.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SolarWinds | Web Help Desk | 12.8.8 HF1 and below |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40553
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm release-notes
- 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 exploit